Me I beleive in the Gaia Theory (James Ephraim Lovelock) and this is...

"The Revenge of Gaia", which argues that the lack of respect humans have had for Gaia, through the damage done to rainforests and the reduction in planetary biodiversity, is testing Gaia's capacity to minimise the effects of the addition of greenhouse gases in the atmosphere. This eliminates the planet's homeostatic negative feedback potential and increases the likelihood of positive feedbacks associated with runaway global warming. Similarly the warming of the oceans is extending the oceanic thermocline layer of tropical oceans into the Arctic and Antarctic waters, preventing the rise of oceanic nutrients into the surface waters and eliminating the algal blooms of phytoplankton on which oceanic foodchains depend. As phytoplankton and forests are the main ways in which Gaia draws down greenhouse gases, particularly carbon dioxide, taking it out of the atmosphere, the elimination of this environmental buffering will see, according to Lovelock, most of the earth becoming uninhabitable for humans and other life-forms by the middle of next century, with a massive extension of tropical deserts. Given these conditions, Lovelock expects civilization will be hard pressed to survive.