Book Review: Charles Mann - The Wizard and the Prophet

Both of Mann's previous books, 1491 and 1493, described in great detail how various societies have interacted with local and global ecology, but never before has he offered such a clear framework for thinking about the reasons why humanity can't resist the urge to mold our environment to our activities and not the other way around, and drawn such clear lines between different human approaches to nature. This is a full-length expansion of "The State of the Species", his 2012 essay for Orion magazine, wherein he compared humanity to a rapidly bacteria that is just beginning to reach the edge of its petri dish, and now faces a stark choice between a catastrophic decline in numbers or a gradual accommodation to the limits of future possibilities. The first attitude he terms the Prophet mindset, personified by William Vogt, a bird ecologist whose research into guano production led him to warn that unchecked human activity would lead to calamitous resource shortages. The second stance is what he calls the Wizard mentality, represented by Norman Borlaug, a Nobel-winning crop scientist whose experiments with rice and wheat created the Green Revolution that fed billions of additional people. A worthy successor to the fascinating dialogues about environmentalism in John McPhee's superb Encounters With the Archdruid, Mann's work is a detailed and scientifically rigorous look at our efforts to defy what seems like an ecological equivalent to the law of gravity: that every species eventually hits the carrying capacity of its environment, and must choose between a calm acceptance of a ceiling to its ambitions or the grim process of decline due to overreach.

The book itself is, quite cleverly, structured into an analogue of the model of biological expansion it it proposes: an opening section discussing the philosophy of growth; profiles of the early careers of Vogt and Borlaug; four Element sections on the challenges of Earth (attempts to increase the yields of agriculture), Water (ensuring its future potability and availability), Fire (increasing the amount of usable energy), and Air (dealing with the issues of climate change); examinations of the later careers of Vogt and Borlaug as they each attempted to spread their philosophies; and then a brief final section reflecting on the difficulty of actually applying any of this knowledge in a useful way. Mann goes into more detail about the well-known Jevons paradox, where efforts to increase efficiency can actually increase the total amount of resources being used, in the appropriate Fire section, but right from the beginning you can think of the Wizards and Prophets as representing different arguments about the paradox. Efficiency by definition has a numerator and a denominator, and Wizards are arguing that since technological progress will mean that you won't run into absolute Malthusian limits on resources, you can keep population stable or even increase it as long as you also increase the efficiency of resource consumption, whereas Prophets would argue that Malthusian limits are inevitable, and therefore you either need to reduce the amount of people or accept drastically reduced standards of living.

The discovery that nitrogen played a vital role in fertilizer, and that guano's prodigious quantity of nitrogen would make it an excellent aid to crop yields, led to a run on the vast deposits of guano on Peru's Chincha Islands. Vogt helped formalize the ecological cycle of guano production: the fact that the El Niño cycle controlled the temperature of sea currents, hence affecting the quantity of plankton, hence affecting the population of seabirds, hence ultimately determining the amount of guano, placed in his view an upper bound on the rate at which guano could be sustainably harvested from the islands in order to ship off to grow crops. Meanwhile, Norman Borlaug's experiences in agronomy implied that there were not necessarily limits to seemingly immutable biological constraints. His research in Mexico focused on encouraging disease resistance in wheat: while developing a variety of wheat that was nutritious, hardy, high-yielding, good-tasting, and rust-resistant could be incredibly tedious and arduous, if a form of wheat could be developed that was resistant to blights and rusts, then at a stroke the problem of the recurrent famines that struck poor nations could be solved. Vogt's research implied that efforts to surmount an ecosystem's carrying capacity would just lead to catastrophes down the line, as seen in the recurrent booms and busts of the seabird population, but to Borlaug, there seemed to be no humane alternative but to try to provide more food.

Of course, to a Prophet, the Wizard approach seems perverse, as breeding better wheat just ultimately breeds more people, and so the four Element sections chronicle our attempts to kick the population can down the road. For Earth, Borlaug's development of better wheat fit into a grand heroic tradition of improvements to agriculture. Liebig's Law of the Minimum states that growth is limited by the scarcest factor, so past discoveries like the Haber-Bosch process to create artificial fertilizer and avoid the seabird bottleneck, and current projects, such as developing superior forms of photosynthesis like the C4 process in rice, are efforts to disprove the Malthusian maximum that population can increase geometrically while agricultural yields can only increase arithmetically. We are leaving money on the table in the form of inefficient agricultural strategies, but sustainable agriculture is difficult: corporate megafarms have acceptable yields and use little labor but are very wasteful and have a huge ecological footprint, whereas smaller and more energy-efficient farms could improve total yields but would require more labor, which for many people is a historical step backwards. Similarly, we could shift our diets to get more caloric bang for the buck, not just abandoning meat but also replacing fields of wheat, rice, and maize with fields of cassava, potato, and sweet potato and orchards of bananas, apples, and chestnuts. This would give us yields of far more calories per acre, at the cost of a radical transformation of every cuisine on earth. 

For Water, similarly vast lifestyle changes might be in order. There's a continual sense that much of the world is running on borrowed time when it comes to water supplies. Marc Reisner's Cadillac Desert painted a grim picture of what the American West might look like once all the groundwater ran out; Southern California is the poster child for water conflicts, famously depicted in the movie Chinatown, but even though it's hard to innovate water supplies in the same way as modified wheat, Mann profiles Israel's National Water Carrier project and drip irrigation systems, which are both "hard path" and "soft path" attempts, respectively, to make every drop go farther. Mann explains that there's a philosophical split between the "hard path" of large centralized water projects, like the large dams and desalinization projects beloved of engineers, and the "soft path" of smaller solutions, like collecting stormwater or reusing wastewater. Water has been treated as a semi-public good in most countries, with cheap consumer prices on top of a vast web of complex political arrangements; privatizing water supplies is anathema to most voters, and yet decisions about how to best maximize remaining groundwater supplies will have to be made, with profound consequences. Mann doesn't cite Karl Wittfogel's infamous "hydraulic despotism" thesis about how many ancient empires used their control over water supplies to maintain power, but a future of dam/canal/aqueduct/desalinization plant megaprojects might be very different politically than one of more distributed and small-scale solutions oriented around conservation and reuse, even without veering into Mad Max/Dune science-fiction territory.

This basic division between proponents of small and large solutions to problems is recapitulated in the Fire section, which concerns energy production. I remember that Peak Oil used to be in the news quite frequently in the mid-to-late 00s, as gas prices spiked, but you don't hear so much about it these days. The worry was that the suburban lifestyle was artificially cheap, due to underpriced oil, and thus doomed to collapse when gas prices made big cars/long commutes/spread-out development unaffordable. That hasn't come true (yet?), but it's interesting that people have been mispricing oil since it was first discovered (there's a funny anecdote about Andrew Carnegie digging a big reservoir of crude oil in anticipation of a big price spike caused by the exhaustion of oil supplies, seeing that there was plenty more where that came from, and then making tons of money anyway). Marion King Hubbert's idea of Peak Oil makes intuitive sense, which is one big reason why even energy corporations devote money to alternative fuels, yet the time has never seemed quite right for inventors like Augustin-Bernard Mouchot or John Ericsson to make money off of their solar power designs. 

I wish Mann had devoted more space to talking about the vast improvements in solar energy production spurred by Obama's 2009 stimulus, but often a big stumbling block is not so much the specific technology as how it's deployed; he discusses the opposition of many environmentalists to big solar or wind projects. I myself have similar annoyances with climate activists who won't just take the W and accept that replacing large coal plants might require large solar farms, since some of their objections are also disguised NIMBYism (see the opposition to wind farms off of Martha's Vineyard), but even if anti-nuclear sentiment is often overblown, it is incontrovertible that big projects can have big downsides, and that smaller solutions need more visibility as well.

The Air chapter is all about climate change. Mann spends most of the section discussing the history of atmospheric science, from Jean-Baptiste-Joseph Fourier's theories of thermostatic equilibrium, to John Tyndall, Svante Arrhenius, and Guy Callendar's discoveries of how powerful of a warming agent carbon dioxide is. I've always had a deep respect for how difficult it is to build working models of anything, and so I appreciated Mann's explication of the intellectual work it took to go from learning that the composition of the air matters to the IPCC's current efforts to build climate models that will actually tell us something useful and accurate. Of course, the science is meaningless if we ignore it, so there's some discussion of how hard it is for humans to make rational decisions in the present about hypothetical future people. It's not worth saying much about climate change deniers, who at this point aren't going to be convinced by any quantity of graphs and charts. There's simple greed and ignorance, of course, but as efforts to address climate change have shifted from specific problems like sulfuric acid rain destroying forests or CFC's destruction of the ozone layer to more abstract issues like general carbon dioxide levels, it's become harder for even well-intentioned people to decide what to do. 

A classic formulation of this dilemma is "if building coal plants is necessary for China to industrialize and therefore reduce poverty, is it moral to tell them to industrialize more slowly by using renewables instead, since the poor people are alive right now but most of the people who will suffer the consequences of climate change haven't been born yet?" If you're pondering the exact relations among economic growth, environmental destruction, and planetary limits, it's not obvious you'd start with limiting China's development as opposed to, say, here in the US. Mann visits China and points out that industrialization brings costs right now via air pollution, but even if you agreed that there's got to be a better way, it's not like even fairly stodgy solutions like carbon capture are uncontroversial, and geoengineering proposals range from wackier options like dumping sulfur dioxide in the stratosphere to more plausible ones like Dune-style tree planting in the Sahara and the Outback. Shifting to renewables would bring vast new costs as well, and he relates a funny example of how difficult it would be to completely replace fossil fuels in the US:

Altogether, the Jacobson-Delucchi team estimated, the United States would need to build:

• 328,000 new onshore 5-megawatt (MW) wind turbines (providing 30.9 percent of U.S. energy for all purposes)
• 156,200 offshore 5-MW wind turbines (19.1 percent)
• 46,480 50-MW new utility-scale solar photovoltaic power plants (30.7 percent)
• 2,273 100-MW utility-scale concentrated solar power (i.e., Mouchot-style solar mirror) power plants (7.3 percent)
• 75.2 million 5-kilowatt (kW) home rooftop photovoltaic systems (3.98 percent)
• 2.75 million 100-kW commercial/government rooftop systems (3.2 percent)
• 208,100 1-MW geothermal plants (1.23 percent)
• 36,050 0.75-MW devices that harness wave power (0.37 percent)
• 8,800 1-MW tidal turbines (0.14 percent)
• 3 new hydroelectric power plants (all in Alaska, 3.01 percent)

As lagniappe, the nation also would convert all cars and trucks to run on electricity and all planes to run on supercooled hydrogen - all the while building underground systems that store energy by heating up rock under most of the buildings in the United States.

Mann returns to the fates of Vogt and Borlaug, after World War 2 when the new international order was being determined. Vogt attempted to raise environmentalism's profile by organizing events like the International Technical Conference on the Protection of Nature and working for Margaret Sanger's Planned Parenthood, eventually alienating everyone but also inspiring influential works like MIT's The Limits to Growth and Paul Ehrlich's The Population Bomb. Much like Gifford Pinchot's hopeful vision of stewardship over nature won out over John Muir's anti-civilization wilderness promotion, people wouldn't have liked to hear Vogt's jeremiads even if he'd been more personable. Meanwhile, Borlaug tried to spread his hard-won knowledge to collaborators in other countries, like Mankombu Sambasivan Swaminathan in India. There's a really fascinating story of how Borlaug tried to ship some precious seeds of new wheat to Swaminathan from Mexico to India via Los Angeles during the Watts riots and the Kashmir War between India and Pakistan. There's also further thoughts on how even miracles like this wheat can struggle if they aren't adapted to the local palate. The wheat Borlaug had sent was western-style, which required further crossbreeding and irradiation to turn it into the Sharbati Sonora wheat that made acceptable roti to the Indians, which brought to mind current innovations like the non-meat Impossible Burger, which people are happy to eat, just as long as it looks and tastes exactly like a regular burger and fits exactly into current foodways and avoids "GMO" technologies that people don't understand. Science is always working uphill. 

Mann closes the book with an account of an 1860 Samuel Wilberforce-Thomas Huxley debate about evolution. One of the key jabs that Wilberforce, who was arguing against evolution, tried to land was asking Huxley if he was descended from apes on his grandmother's or his grandfather's side. Hidden in there is a serious question about if humanity is subject to the same laws that seem to govern every other species. Earlier in the book Mann ruminated on a memorably depressing conversation with infamous biologist Lynn Margulis:

Was Margulis correct that we are fated by natural law to wreck our own future? History provides two ways of approaching this question. The first draws on the inspiring manner in which a group of scientific eccentrics and outsiders slowly built up today’s picture of climate change just in time to use that knowledge to halt its worst effects. The second focuses on the discouraging way that political institutions have been unable to grapple with the challenge and climate change became the subject of a cultural battle over symbols and values. The second approach leads to the conclusion that Margulis was correct: indecision and political tensions will give the opportunity for our wastes to destroy us. Only the first approach leads us to do something about climate change, following the path either of Wizards or of Prophets.

While Mann is hopeful that we can come to an accord with the world around us, even seemingly dramatic precedents in our history that imply that humanity can change, like women's suffrage or the abolition of slavery, come with plenty of caveats, most notably that they take time. All around us, there are warning signs of a world that is being profoundly shaped by human behavior, the "edge of the petri dish" is in sight, and it's quite uncertain that we will ever be able to work harmoniously within Earth's limits (sci-fi schemes of extraterrestrial colonies, à la Elon Musk, are a tacit acceptance of this). All we can do is try.