The warming of the oceans is extending the oceanic thermocline layer of tropical oceans over the Arctic and Antarctic waters. This would prevent the rise of oceanic nutrients into the surface waters and eliminate the algal blooms of phytoplankton. As phytoplankton and forests are the main ways in which Gaia draws down 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 this century, with a massive extension of tropical deserts. This rather extreme view is held by only a few other scientists.