In 2007, he published "," a book detailing the progressive effect of global warming in several planetary ecosystems, from 1 degree to 6 degrees and further of average temperature rise of the planet. Special coverage is given to the positive feedback mechanisms that could dramatically accelerate the climate change, possibly putting the climate on a runaway path. As a possible end scenario the release of methane hydrate from the bottom of the oceans could replicate the end-Permian extinction event. This book won the Royal Society's science book of the year award in 2008.