A review of The Human Footprint: A Global Environmental History by Anthony Penna. An excerpt from A Brain for All Seasons: Human Evolution and Abrupt Climate Change by William H. Calvin. An interview with John Shepherd on books on science and climate change. Is Earth past the tipping point? A review of How to Cool the Planet by Jeff Goodell. Despite its potential to trigger conflict, geoengineering will likely be part of the global response to climate change. Could a rich man's experiment trigger an Ice Age? A new effort will be launched to craft research restrictions for geoengineering, or large scale efforts to tinker with the planet's climate system (and more and more). From Wired, 200 scientists gather in an attempt to determine how research into the possibilities of geoengineering the planet to

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