Earth systems: No place like home

Journal name:
Nature
Volume:
508,
Pages:
41–42
Date published:
DOI:
doi:10.1038/508041a
Published online

The newest chapter in James Lovelock's Gaia saga holds out hope, finds Tim Lenton.

A Rough Ride to the Future: The Next Evolution of Gaia

James Lovelock Allen Lane: 2014. ISBN: 9780241004760

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In A Rough Ride to the Future, James Lovelock argues that humans must survive difficult days ahead if their descendants are to become the future saviours of Gaia — the self-regulating Earth system that he conceived nearly 50 years ago. No longer just another species, as he argued in The Ages of Gaia (Oxford University Press, 1988), Homo sapiens is now “one of the truly important species of the Earth's history”, destined to help Gaia to survive in the face of an ineluctably brightening Sun. The inventor's audacious book is thus part science fact and part science fiction, homily and history lesson.

Lovelock argues that our information-based cultural evolution is now a million times faster than good old natural selection. He traces this remarkable transition back to Thomas Newcomen's invention of the steam engine in 1712. That coal-powered engine's capacity to perform sustained useful work exceeding 1 kilowatt is Lovelock's thermodynamic definition of the start of the Anthropocene — the planetary epoch defined by human transformation. Powered by fossil fuels, the ensuing positive feedbacks have propelled an exponential growth in material flows, human population and information processing.

Tim Cuff/Alamy

James Lovelock in his lab — inventions, notebooks and other materials from which will go on show at the Science Museum in London from 9 April.

But human innovation is just the latest in a long line of biological 'innovations' that have transformed Earth. For example, roughly 3 billion years ago, photosynthetic bacteria evolved the ability to split water, leading to the build-up of oxygen in Earth's atmosphere. Lovelock argues that this innovative capacity of life was crucial to the making of a world that supported human evolution, is crucial to our reshaping of the planet today, and will be essential for both our survival and Gaia's.

So, how does Lovelock rate our chances of making it through this century? Having heralded the apocalypse in The Revenge of Gaia (Allen Lane, 2006) and backed off a bit in The Vanishing Face of Gaia (Allen Lane, 2009), here he tries to shut the stable door after the horse (climate change) has bolted. He sees no prospect of us collectively reducing carbon dioxide emissions, and has nothing good to say here about geoengineering. That leaves adaptation as the only option.

Lovelock pictures most of us retreating to high-tech cities protected from the ravages of climate change by air conditioning — if we can afford it. He sees a glimmer of hope that a dwindling supply of cheap fossil-fuel energy may be slowing our exponential growth in material consumption. Meanwhile, to power those high-tech cities, he remains a consistent fan of nuclear power and even shows a soft spot for natural gas, while continuing to critique the weak and intermittent supply of wind energy. He fails to discuss solar power, perhaps because he sees an unlimited supply of renewable energy as a great danger to us and to the planet — we are, collectively, still too immature to handle it wisely.

Lovelock sees us as tribal carnivores, doomed to bumble around in the technological world we have created. But at long last he seems to be conceding that we might grow culturally to the point of becoming a constructive part of Gaia. This is the heart of the book — the vision of a teleological future Gaia, filled with foresight and purpose to survive, thanks to the consciousness bestowed on her by humanity. For example, we can consciously intervene to protect Gaia from future asteroid impacts. The irony here is that teleology is exactly what Lovelock had to purge from his original Gaia hypothesis to satisfy his scientific critics. They may well squirm at the sight of “Gaia's goal” returning.

The reason Gaia needs our help, Lovelock argues, is that the unconscious negative-feedback mechanism that has so far kept the planet cool is destined to fail. Up to now, the Sun's brightening, which tends to warm Earth, has been counteracted by accelerated weathering of the continents, which has decreased CO2 levels in the atmosphere. But before we started boosting it, the CO2 concentration was getting close to the lower limit for photosynthesis. Hence there is a need for either some other cooling mechanism, or a more heat-tolerant intelligent life form.

Lovelock tentatively speculates on what such creations might look like. First he imagines us symbiotically merging with electronic components to form a world of cyborgs, using biological and artificial intelligence to sense and regulate the planet's state. Eventually he sees wet organic life having to be replaced by dry electronic life that is better able to cope with an over-hot Sun. He even imagines such artificial life forms 'evolving' much faster than us, because information is transferred much faster by electronics than by neurons.

This is a popular science book. Yet it does reveal something about how the author's remarkable mind works — making intuitive leaps between topics that most of us would not think to connect. One moment he is dwelling autobiographically on the cultural environment that fostered his own inventiveness, the next he is considering how invention accelerated the evolution of life. The leaps are so great that at times even Lovelock seems unsure where his argument is going. But this is strangely appropriate when the subject is the long-term future.

A Rough Ride to the Future is a more optimistic book than its two predecessors, although Lovelock still thinks that there will be a massive drop in human population — by means that remain unclear. What he seems to be doing, perhaps unwittingly, is creating a belief system to help us through the difficulties ahead. There is a sense here that Lovelock has been to the mountain top, looked over, and seen a promised land. Now almost 95, he may not get there with us, but he wishes humanity and Gaia an exciting future together.

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