Books

Open educational resources movement needs to move beyond voluntarism (essay)

The dominion of open educational resources is apparently looming large, if one were to judge by a blog thread touched off with a panel discussion at a recent Knewton event. David Wiley, participating in the panel, made the bold claim that “in the near future, 80 percent of textbooks would be replaced by OER content.” Jose Ferreira responded critically to that view a few days later with a blog post, to which Wiley offered a dissenting reply. Michael Feldstein then weighed in with a dissenting perspective of his own.

It’s a spirited and fruitful discussion; well worth a read. Their comments, though, didn’t tackle what I’ve come to see as the core issue for the OER movement, a foundational assumption that has crimped its progress. The assumption holds that because open-source educational content is like open-source software -- in that it’s free content that you can chop up, remix, and share with anyone -- its application and uses should follow in a similar way.

The short history of the two movements makes clear that this is not the case. As David Wiley points out, the first openly licensed educational materials were published more than 15 years ago, around the time that Linux led the movement of open-source software (OSS) into the mainstream. So why did one open-source movement take off as the other tarried on the margins, championed only by the most stalwart advocates?

While Linux has long been part of standard practice, and our daily computing lives would be unthinkable without open-source software, more than 90 percent of faculty textbook adoptions in the U.S. are still locked-down, expensive commercial materials. Most don’t doubt the unsustainability of the present course (including most publishers), but it’s also plain to see that the OER movement had not yet offered a truly satisfying alternative. The failure of OER to become mainstream at this point is only underscored by the myriad forces working in its favor: economic pressures, greater administrative accountability, government oversight and budget cuts, and a truly broken publisher model.

A clear reason for the different trajectories is the commercial support that OSS has enjoyed, and that OER has not. Contrary to the common view that OSS has advanced largely through loosely organized communities of volunteers, it’s actually often strongly supported through private enterprise. More than 80 percent of the contributions to Linux, for example, come today from companies like Google and Samsung. But the success of OSS isn’t simply through commercial appropriation. Instead, companies were able to support OSS because they were building on an already-present foundation of voluntarism in the hacker community. While a volunteer community of course exists in OER, it does not have the depth and breadth of its OSS counterpart. The voluntarism of the hacker community does not, in other words, map well onto the community of academic instructors.This situation isn’t an accident of history but reflects a fundamental difference in the roles and self-understanding of each group.

With OSS, the hacker is often an end user but more centrally the creator and modifier of code. And to the extent that hackers form a community, it is a community of problem-solvers addressing issues that concern their work directly. In his seminal book on hacker open-source culture, The Cathedral and the Bazaar, Eric Raymond suggests that “Every good work of software starts by scratching a developer’s personal itch.” Contrast this with the relationship faculty have to the educational content they use: for most, it’s a tool for teaching a class, a means of supporting an activity that is largely extrinsic to the tasks of creating and modifying pedagogical content. Most instructors are not editors, let alone creators of their classroom content; they are simply end users.

If there’s a personal itch to scratch at all, it’s usually in the area of original scholarship and research, not teaching materials (let’s recall that the Internet was born to share research, not lesson plans). For most instructors, the textbook is a convenient package, without which the task of managing a class would be that much more laborious. Commercial publishers have long recognized what the OER movement has not: that often-overworked and underpaid instructors are looking to content and course technology to make their lives easier, not to take on the additional responsibility of managing their own content without financial recognition for that labor. Unlike the open-source hacker, the thrill of belonging to a community of problem-solvers of content simply isn’t their thing. To truncate an otherwise large topic, instructors are not hackers and that changes everything. Or it should have for the OER movement.

The recent gains of, and the growing prospects for, OER are, in fact, a tacit acknowledgement of this difference. No doubt the single biggest success to date for the movement is the OpenStax project, but this success breaks any illusion that the practice of OER is analogous to that of open software. Connexions, the OpenStax predecessor project at Rice, languished for years as an open-source content platform until Rice hired Joel Thierstein as associate provost to turn the project around. What did he do? Thierstein, who previously worked in the private sector developing content for the telecommunications industry, had a simple and very powerful idea: raise grant money to hire the same companies that ghostwrite textbooks for the traditional publishers, and then release the texts into the public domain under the most open license available.

As commercial textbook equivalents, their use required no behavioral changes for faculty. They would not be “learning objects” or fragments that required additional faculty work. Faculty could use them as teaching tools, just as they would conventional content, except, in this case, they’re free. Like the commercial publishers, Thierstein rightly understood that faculty want an easy and straightforward way to adopt high quality and appropriate content. Thierstein’s success enabled Rice to go forward with additional fund-raising and the Connexion’s rebranding as OpenStax. A simple idea has had a significant impact.

And yet for all the success of OpenStax, it’s also clear that a free version of a commercial text will never alone be sufficient for OER to reach the mainstream, nor should it be. Some learning technologies, either already in use or emerging, have the capacity to improve student success significantly. The OER movement’s almost singular focus on cost can obscure the larger objective -- actually getting more students through to graduation while ensuring that they’ve learned (and enjoyed learning) something along the way.

The risk for the OER movement is that it unwittingly reinforces the kind of resource disparities we see everywhere else in our society: a situation in which the well-off enjoy content with the latest technologies and practices, and the not-so-well-off manage without them. To be sure, OpenStax partnerships with third-party technology partners are a recognition of this need, but these relations are still established within the traditional publisher/tech partner binary model, with the difference that the core content is low-cost or free. As important as that project is, it doesn’t yet realize the promise of OER as disaggregated high-quality content created and modified from anywhere.

A better way forward is to compensate the stakeholders -- faculty, copyright holders, and technologists, principally -- for their contributions to the OER ecosystem. This can be done by charging students nominally for the OER courses they take or as a modest institutional materials fee. When there are no longer meaningful costs associated with the underlying content, it becomes possible to compensate faculty for the extra work while radically reducing costs to students. While I launched a new venture to do this, what’s needed are lots of entities -- for-profit and nonprofit -- to experiment with funding models. It’s all achievable and there will likely be no single way to accomplish it.

From this will emerge a new breed of courseware, one that preserves the low cost and flexibility of open content while embracing learning technologies that support faculty and student success. Certainly such a model involves costs, though not so much for the content as for the tools that improve its use and for the people on the ground who are actually doing the work of curating and adapting materials.  Align the incentives in the right way, and this model of for openness can empower faculty members and institutions in unprecedented ways. It will encourage local innovation so that, over time, the courseware, now unlocked and financially supported, becomes an expression of the teaching itself. 

Openness, then, lends itself to a new order of distributed content development that includes outstanding learning technologies; I think all the bloggers mentioned above recognize this. But precisely because instructors are not hackers and belong to an entirely different community of practice, a system for distributed content development also needs to be accompanied by a system of distributed financial incentives. When this all comes together -- and it will -- then courseware will escape commodification and become a creative and low-cost force in education. Only then should we begin to count the percentages.

Brian Jacobs is founder & CEO of panOpen.com.

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New book explores achievements and challenges of China's 'rising research universities'

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New book explores achievements and challenges of Chinese research universities as they continue their quest to achieve "world-class" status.

Book argues that mentoring programs should try to unveil colleges' "hidden curriculum"

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Are students evaluated on their academic work, or on how well they navigate the college environment? Both, a recent book argues -- which is why mentoring programs should aim to unmask the "hidden curriculum" for at-risk students.

New book argues that education schools aren't adequately preparing teachers

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New book argues that education schools too often neglect teacher training -- leaving it up to teachers to figure things out on their own.

Review of Darin Weinberg, 'Contemporary Social Constructionism: Key Themes'

Like a t-shirt that used to say something you can’t quite read anymore, a piece of terminology will sometimes grow so faded, or be worn so thin, that retiring it seems long overdue. The threadbare expression “socially constructed” is one of them. It’s amazing the thing hasn’t disintegrated already.

In its protypical form -- as formulated in the late 1920s, in the aphorism known as the Thomas theorem – the idea was bright and shapely enough: “If men define situations as real, they are real in their consequences.” In a culture that regards the ghosts of dead ancestors as full members of the family, it’s necessary to take appropriate actions not to offend them; they will have a place at the table. Arguments about the socially constructed nature of reality generalize the Thomas theorem more broadly: we have access to the world only through the beliefs, concepts, categories, and patterns of behavior established by the society in which we live.

The idea lends itself to caricature, of course, particularly when it comes to discussion of the socially constructed nature of something brute and immune to argumentation like, say, the force of gravity. “Social constructivists think it’s just an idea in your head,” say the wits. “Maybe they should prove it by stepping off a tall building!”

Fortunately the experiment is not often performed. The counterargument from gravity is hardly so airtight as its makers like to think, however. The Thomas theorem holds that imaginary causes can have real effects, But that hardly implies that reality is just a product of the imagination.

And as for gravity -- yes, of course it is “constructed.” The observation that things fall to the ground is several orders of abstraction less than a scientific concept. Newton’s development of the inverse square law of attraction, its confirmation by experiment, and the idea’s diffusion among the non-scientific public – these all involved institutions and processes that are ultimately social in nature.

Isn’t that obvious? So it seems to me. But it also means that everything counts as socially constructed, if seen from a certain angle, which may not count as a contribution to knowledge.

A new book from Temple University Press, Darin Weinberg’s Contemporary Social Constructionism: Key Themes, struggles valiantly to defend the idea from its sillier manifestations and its more inane caricatures. The author is a reader in sociology and fellow at King’s College, University of Cambridge. “While it is certainly true that a handful of the more extravagant and intellectually careless writers associated with constructionism have abandoned the idea of using empirical evidence to resolve debates,” he writes, not naming any names but manifestly glaring at people over in the humanities, “they are a small and shrinking minority.”

Good social constructionist work, he insists, “is best understood as a variety of empirically grounded social scientific research,” which by “turn[ing] from putatively universal standards to the systematic scrutiny of the local standards undergirding specific research agendas” enables the forcing of “the tools necessary for discerning and fostering epistemic progress.”

The due epistemic diligence of the social scientists renders them utterly distinct from the postmodernists and deconstructionists, who, by Weinberg's reckoning, have done great damage to social constructionism’s credit rating. “While they may encourage more historically and politically sensitive intuitions regarding the production of literature,” he allows, “they are considerably less helpful when it comes to designing, implementing, and debating the merits of empirically grounded social scientific research projects.”

And that is being nice about it. A few pages later, Weinberg pronounces anathema upon the non-social scientific social-constructionists. They are “at best pseudo-empirical and, at worst, overtly opposed to the notion that empirical evidence might be used to improve our understanding of the world or resolve disputes about worldly events.”

Such hearty enthusiasm for throwing his humanistic colleagues under the bus is difficult to gainsay, even when one doubts that a theoretical approach to art or literature also needs to be “helpful when it comes to designing, implementing, and debating the merits of empirically grounded social scientific research projects.” Such criticisms are not meant to be definitive of Weinberg’s project. A sentence like “Derrida sought to use ‘deconstruction’ to demonstrate how specific readings of texts require specific contextualizations of them” is evidence chiefly of the author’s willingness to hazard a guess.

The book’s central concern, rather, is to defend what Weinberg calls “the social constructionist ethos” as the truest and most forthright contemporary manifestation of sociology’s confidence in its own disciplinary status. As such, it stresses “the crucially important emphases” that Weinberg sees as implicit in the concept of the social – emphases “on shared human endeavor, on relation over isolation, on process over stasis, and on collective over individual, as well as the monumental epistemic value of showing just how deeply influenced we are by the various sociohistorical contexts in which we live and are sustained.”

But this positive program is rarely in evidence so much as Weinberg’s effort to close off “the social” as something that must not and cannot be determined by anything outside itself – the biological, psychological, economic, or ecological domains, for example. “The social” becomes a kind of demiurge: constituting the world, then somehow transcending its manifestations.

It left this reader with the sense of witnessing a disciplinary turf war, extended to almost cosmological dimensions. The idea of social construction is a big one, for sure. But even an XXL can only be stretched just so far before it turns baggy and formless -- and stays that way for good.

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Book offers tips to make academic meetings not just bearable, but productive

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An upcoming book argues that meetings -- one of the most loathed aspects of academic life -- are untapped sources of creativity and insight.

Column on new series of scholarly anthologies in ebook format

While looking around for scholarship on witchcraft trials just the other day (not in connection with current events, though with American politics you never know) I stumbled across Crime: A Batch From The Journal of Interdisciplinary History, an ebook in a new series from MIT Press that launched in May.

It reprints Edward Bever’s "Witchcraft Prosecutions and the Decline of Magic” from 2009, plus nine other articles on crime across the past few centuries. As far as I can tell, Batches is the first of its kind, at least in ebook format: a series of thematic anthologies drawn from the back files of scholarly journals that MIT publishes. Two other titles have appeared so far, Spies: A Batch from the Journal of Cold War Studies and The United States and China: A Batch from International Security. They’re all in an attractive and sensibly designed format, at the modest price of $6.99. (If an ebook series along the same lines as Batches does exist, I'll undoubtedly hear about it, and in that case will update this column with the pertinent information.)

Describing so ethereal an artifact as “attractive” may sound strange, but plenty of titles coming across my ereader have been real eyesores. (Both unnavigable and un-proofread, they've seemed overpriced even when free.) The MIT volumes have functional tables of contents, available both at the start of the file and via drop-down menu. Not only are there links between the text and endnotes but they work in both directions.

That is something you ought to be able to take for granted, but can't. No major investment of resources is required — just a little attention to detail when preparing the text. It’s time for readers to become a lot more aggressive about demanding adequate production values from the ebooks they bring out.

That's not to say that publishing volumes of papers selected from a specific journal is a new idea, even in digital format. For example, there is Classics from IJGIS: Twenty years of the International Journal of Geographical Information Science and Systems and ISO Science Legacy: Reprinted from "Space Science Reviews" Journal, V.

Apart from being specialized and quite expensive -- even by hardback standards, let alone for an ebook — they differ from the Batches collections by being stand-alone works, rather than part of a series. The title of SO Science Legacy: Reprinted from "Space Science Reviews" Journal, V would seem to imply that volumes I-IV are available to download by anyone with lots and lots of money, though in fact there’s just the one.)

And of course material from JSTOR and other repositories can be stored and read on a handheld device. Such material is almost always in PDF, however, which has limited flexibility compared to text in an ereader-specific format (e.g., mobi or epub). The latter allow the user to adjust the size of the type, and in my experience the option to highlight articles in PDF is luck of the draw, while that is less of a problem in the other formats.

A small but expanding array of scholarly periodicals now appear in ebook editions, including the American Academy of Arts and Sciences flagship Daedalus and the American Economic Association’s quarterly Journal of Economic Perspectives. Likewise with a number of law reviews, including many of the most prominent ones. Diverse as these journals are, they all routinely publish material of potential interest to non-specialist readers. Selling individual issues online gets the journal in front of a wide public without the hazards of newsstand distribution.

The new series from MIT is a synthesis of all the developments just listed — and, in some regards, an improvement on them. While reading around in the debut volumes, I was impressed both by the range of issues covered in each volume and by how well the selections complemented one another. For that, too, cannot be taken for granted. Collections of scholarly papers are often forced together rather than edited, much less integrated into a cohesive volume. Reading one is like attending a shotgun polygamous marriage among strangers, albeit not so memorable.

Jill Rodgers, marketing manager for MIT Press, made time to respond to my questions about the series by email. Her answers went some way toward explaining why the collections hang together better than compilations often do.

For one thing, the press monitors how its journals are being used. "We have access to traditional reports like article downloads and citations,” Rodgers told me. "Using Google Analytics and Altmetric.com, we also get a lot of information about what sites are bringing traffic to our website, who’s talking about our articles on blogs and in media outlets, how many people are bookmarking articles in Mendeley, who’s sharing abstracts via Twitter, etc.”

The possibility of using all that data to brainstorm ideas for ereader collections came up during a retreat late last year. The gestation time for the series was just six months.

"To create a Batch,” she said, "we first identify an article or topic that is getting a lot of play. We move to our archives and do some searching to see if we have enough content ... then reach out to the journal editor to see if he/she agrees the topic is skillfully covered by the journal and is willing to curate a final [table of contents].” Ideally the collection will include 6 to 10 papers; the titles now available contain 10 each.

While the marketing department’s data generated the topics, the collections' salience comes from the work of the journal editors who, "besides weighing the hundreds or thousands of articles available, will also compose an introduction” that explains "the impact of the articles within the field and their importance to the journal.”

The collection then goes into the digital production pipeline. “The first round of three Batches took 3-4 months from proposal to loading on Amazon,” Rodgers noted, "but I think that time period will shorten now that we’ve got the hang of it.”

Three more collections are nearly ready to go -- although they aren’t yet listed by online vendors, nor has any other information about them appeared. In other words, you read it here first. They are Gender and Sexuality: A Batch from TDR. (i.e., The Drama Review), Broadening the Domain of Grammar: A Batch from Linguistic Inquiry, and Responding to Terrorism: A Batch from International Security.

Rodgers indicated that the press has "another half dozen or so 'half-baked batches' that are in various stages.” She and her colleagues are now "also talking about taking requests for new Batches from readers.”

Other university presses are bound to follow MIT’s lead. For one thing, there is the appeal of being able to make use of material already accumulated by the publisher in its stable of journals. A proposal that involves getting content out of the digital warehouse and into revenue-generating circulation seems likely to enjoy the benefit of the doubt. But presses following the model of the new series really should mimic its standards as well.

And if they don’t…. well, let’s take up that topic later, in another column.

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Princeton U. Press's new digital offerings include 'Shazam for birds'

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As Princeton University Press transitions from print to digital products, will it soar in its foray into the app market?

Commentary on Marx-Engels Collected Works dispute

For five years now, off and on -- as massive financial crisis and spiking unemployment have given way to healthy corporate profits and a “recovery” characterized by a surge in low-wage job creation — the word has gone around that people are rediscovering Marx’s Capital.

Whether very many have the stamina to finish its opening chapter, on the commodity form, may be doubted. (Over the years I have been in at least three informal study groups that broke up before getting through the analysis of money in chapter three.) But anyone seriously considering making the trek through Capital might best start with Friedrich Engels’s shorter commentaries on it, including a number of reviews he published anonymously or under pseudonyms, as many an author’s friend has on Amazon.

Engels was not disinterested, of course, but as a critic he had the considerable advantage of knowing, from long and close acquainting, what Marx was trying to say.

You can find those fugitive pieces — and hundreds of other primary works, major and minor — at the Marxists Internet Archive, which has been around since well before the dawn of the World Wide Web. It makes available a constantly expanding array of texts by scores of writers (not all of them Marxists and some not radical by any standard) in an impressive range of languages, and all at no charge. The site draws more than a million readers per month. And yes, traffic has increased during the Great Recession and the not-so-great recovery.

More remarkable even than MIA's long-term survival as an independent and volunteer-staffed institution, I think, has been its nonsectarian, non-exclusionary policy concerning what gets archived. Much left-wing argument has traditionally taken the form of “But X isn’t really a Marxist! I am, and should know, and will demonstrate it now at great length.” (Quite a few documents in the MIA collection consist of just such claim-staking efforts.) MIA volunteers must occasionally shudder or roll their eyes at each other’s choice of authors to include in the archive’s holdings.

But they’ve agreed to “archive the controversy," so to speak -- and MIA’s users are all the better off for everyone’s generosity of restraint. The whole institution seems to embody what Marx himself identified as the goal of his work: a society of “freely associated labor," in which everyone gives according to ability and receives according to need.

And so it is all the sorrier a development that, as of tomorrow -- i.e., May 1st, the reddest of red-letter days -- the first 10 volumes of the English-language Marx-Engels Collected Works (MECW) will be taken down from the site, per a demand by the publisher Lawrence and Wishart.

After almost a decade of allowing its Marx translations to be freely available to a worldwide audience, the press is asserting its copyright in order to make digital access available to universities by subscription. MIA announced the impending change last Wednesday, giving readers one week’s notice.

The following day, I posted a notice and commentary on the situation at Crooked Timber. My tone was, it’s fair to say, a bit testy, but nothing like the tsunami of invective that hit Lawrence and Wishart soon after. A petition against L&W’s decision began circulating and soon had thousands of signatures, many of them accompanied by angry comments.

A friend who teaches political science in London mentioned that she’d written to the press, saying, "Should you really pursue this idiotic line of action, I and dozens of other people are quite happy to organise a boycott (to involve hundreds more) not only of your books, but of citing works published by you.”

Among responses to the news, it was definitely one of the more polite. On Friday, Lawrence and Wishart made a statement that sounded like it was being issued from a bunker under siege.

It characterized the protesters as believing that the press should, in effect, "commit institutional suicide.” Indeed, by that point some people were making the recommendation quite clearly. (For a calmer but quite pointed answer to L&W, see this reply, from the archive.)

Shooting yourself in the foot is seldom fatal, but reloading to fire a second time cannot be recommended. The publisher's aim is improving, however.

David Walters, one of the core group running the digital archive’s daily operations, tells me that Lawrence and Wishart not only demanded removal of the first 10 volumes’ worth of content, running to some 1,100 items, but even the tables of contents for the remaining 40 volumes. Now, the table of contents for a book can be an enticement to buy. With L&W we are faced, not with an overzealous protection of intellectual property, but evidence of diminished capacity to make a rational decision.

While Lawrence and Wishart's decision to re-privatize its translations was ill-advised and then some, its handling of the protest has been almost incomprehensibly self-destructive.

For the press has now dashed to smithereens its hopes of turning the MECW digital edition into a revenue stream. As of a few days ago, the entire collection became available in 50 PDFs that reproduce exactly the layout of the printed volumes -- at least for people savvy enough to know where to locate, and how to download, that sort of thing. Meaning, of course, that we late-adapters will probably have access in a few weeks.

In its statement last week, L&W portrayed itself as victim of "a consumer culture which expects cultural content to be delivered free to consumers." There is -- or rather, there soon will be -- some truth to that. People with no interest in Marx's critique of political economy or Engels's speculations on paleohistory are doubtless going download the PDFs anyway, just to assert that they can.

But what’s really been at issue throughout this past week’s furor is something utterly unrelated to a consumerist ethos. Lawrence and Wishart asserted its juridical rights to restrict, and to charge for, access to intellectual goods to which a great many readers have some reasonable moral claim -- scholars, that is, and Marxists, and Marxist scholars above all, perhaps. When I say they had a moral claim, it’s because those readers were largely responsible for circulating, teaching, and thinking about the texts.

That audience has not begrudged L&W its profit. On the contrary, we’ve given the press most of its business over the decades. Since 1987, the Marxists Internet Archive has expanded, extended, and deepened the public that’s interested in what the publisher has to sell. Establishing and running it, David Walters told me via email, "was a HUGE amount of work done by us before anyone at L&W even heard of the internet.”

The texts Marx and Engels wrote belong to whoever wants to read them. L&W is a delivery mechanism -- one among others -- and at present its viability is under review.

So, to wrap up, a message to David and everyone else at the archive: Thanks. And to Lawrence and Wishart: You’re welcome -- but seriously, cease fire immediately.

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Review of Paul R. Ehrlich and Michael Charles Tobias, 'Hope on Earth: A Conversation'

Last month, both the Pentagon and the Intergovernmental Panel on Climate Change of the United Nations issued projections of the long-term impact of hydrocarbon emissions. They could "slow down economic growth, make poverty reduction more difficult, further erode food security, and prolong existing and create new poverty traps, the latter particularly in urban areas and emerging hot spots of hunger.”

That was the wording of the U.N. report, but the Pentagon sounded much the same, warning that climate change "will influence resource competition while placing additional burdens on economies, societies, and governance institutions around the world." The U.S. military characterizes these tendencies as "threat multipliers that will aggravate stressors abroad such as poverty, environmental degradation, political instability, and social tensions – conditions that can enable terrorist activity and other forms of violence."

Isn't such talk rather alarmist, considering all the research by scientists who reject the idea of anthropogenic global warming? Consider a recent survey of the literature appearing in scientific journals between 1991 and 2012. By my calculation, scientists rejecting the man-made climate change published an impressive 0.17 percent of peer-reviewed papers containing the phrases "global warming" or "global climate change." That's almost one-fifth of one percent!

Clearly the debate is far from over. But a couple of weeks back, an assistant professor of philosophy at Rochester Institute of Technology named Lawrence Torcello argued, in a much-discussed article, that we have "good reason to consider the funding of climate denial to be criminally and morally negligent." His comments inspired an enormous amount of hate mail, including a number of threats of violence. Many of his correspondents were so outraged that they could not bring themselves actually to read the article, relying instead on second- and thirdhand accounts of Torcello's argument that refuted, not what he wrote, but what he could almost certainly be imagined to have intended to say.

Lest anyone feel too sympathetic to Torcello, I must point out that he failed to consider other explanations for why 99.83 percent of the scientific papers discussing climate change assessed it to be a real problem. It is possible, for example, that the researchers who wrote them were funded by the dirty tree-hugging hippies running the Pentagon.

Now, irony regarding any topic that elicits hate mail seldom turns out well. The people you don't anger, you tend to confuse. But it proves almost irresistibly tempting once a debate has reached a standoff. Pieces remain in play on the chess board but neither side makes any progress. That's where things stand now. More than two-thirds of the American public thinks that global warming is real despite the fact that it still gets cold in winter, just as they believe the earth to be spherical even though the front yard is, plainly, flat. Many will stick to those opinions, no matter how well-funded the denialists may be. (There's just no reasoning with some people.)

The more substantial discussion now seems to focus on the processes of climate change -- about whether, say, the continued melting of polar ice will trigger the release of enormous amounts of methane into the atmosphere. If so, how soon? And how fast, once it starts?

The particular mechanisms involved in climate change don't much interest Paul R. Ehrlich and Michael Charles Tobias in their book Hope on Earth: A Conversation, from University of Chicago Press. Ehrlich, the senior author, is a professor of population studies at Stanford University, where he is also president of the Center for Conservation Biology; Tobias is a writer and and documentary director primarily interested in environmental issues. But the question of the tempo of ecological disaster hovers over the discussion as a whole.

Ehrlich's The Population Bomb (1968) became one of the most ubiquitous of alarming paperbacks during the 1970s. It was the neo-Malthussian equivalent of one of Hal Lindsay's books about the End Times; extrapolating from birth rates and the rate of growth of food supplies, it projected worldwide famine and social collapse by about 1980. The promotional copy for Hope on Earth identifies Ehrlich as one of "the world's leading interdisciplinary environmental scientists," and undoubtedly he does remain one of the best =-known. But it is important to keep in mind that some ecologists were sharply critical of The Population Bomb even at the height of its popularity, seeing it as reductive and alarmist. Ehrlich overemphasized the environmental impact of poor countries while underemphasizing that of pollution and wastefulness in the consumerist societies. He also failed to grasp either the increased agricultural output that came with the Green Revolution or the environmental impact of the pesticides making it possible.

Ehrlich ventures no such prognostication in his dialogue with Tobias, conducted over a couple of days at the Rocky Mountain Biological Laboratory in Colorado. As far as I can determine, the exchange took place during 2011, with revisions and elaborations of the transcript from both parties continuing over the following year. In spite of the protracted effort, it remains very much a conversation, for good and for ill. It roams without a map or a set agenda, however provisional, and the speakers are prone to data-dump monologues whose pertinence is not always obvious.

The conversation can be interesting when Ehrlich and Tobias butt heads. They approach environmental matters in distinct and sometimes conflicting perspectives. Tobias seems exemplary of a generation of environmentalists who emerged in Ehrlich's wake -- one for which preserving biodiversity and the wilderness are concerns inseparable from the defense of animal rights, as well as an attachment to ascetic mysticism. (He's reminiscent of the "level 5 vegan" who appears in one episode of "The Simpsons": "I won't eat anything that casts a shadow.") By contrast, Ehrlich clings fast to both a secular worldview and a belief that overpopulation, as such, is a major driving factor in ecological problems. He enjoys the comforts and conveniences available in advanced industrial society and can eat a chicken sandwich with few, if any, moral qualms. "The thing I hate about vegetarians," he says, "is that they're not put off by the screaming of cabbage."

One substantial issue sometimes emerges from their bull session, only to sink back out of view again. It could be called the problem of ecological triage: of how to decide what can be saved and what can't, and on what basis such judgments can be made.

"One of the troubles," says Ehrlich, "is that there are far too limited funds going into trying to save our life-support systems. It's a big allocation issue, how much to spend on description and cataloging and protecting species, as opposed to focusing on populations and the ecosystem services they provide…. Is it more important, for instance, to maintain pest control services in the grain baskets of the world or to protect narrow endemic species in tropical hotspots? Not an easy question to answer, and one with ethical implications."

And one that will come to the fore more and more over the next few decades, if the effects of climate change are felt on anything like the scale that scientists are discussing. Tobias characterizes it -- more generally, if also with more wool -- as the problem of "ascertaining those points of convergence wherein there are thematic flash points, positive pathways that the majority of scientists and people in general can agree upon in an effort to improve the conditions of life on Earth -- both for our species and others."

By "points of convergence" and "thematic flash points," he seems to mean whatever minimal bases of agreement about core values and priorities can serve as a basis for deciding how many arks can be built, and who gets a compartment. The upshot of Ehrlich and Tobias's discussion -- if not their actual conclusion, since they seem not to reach one -- is that no such basis can be identified at present. The effects of climate change may become severe within a couple of decades. The authors probably meant their title to be encouraging, but irony seems to have prevailed, because Hope on Earth offers precious little of it.

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