" Tony Blair, who held the presidency of the G8 in 2005, spent the months leading up to that year’s summit trying to convince Bush that, in his words, “the time to act is now.” It’s plain, Blair said in an address devoted to climate change, that “the emission of greenhouse gases … is causing global warming at a rate that began as significant, has become alarming, and is simply unsustainable in the long-term. And by ‘long-term’I do not mean centuries ahead. I mean within the lifetime of my children certainly; and possibly within my own. And by ‘unsustainable,’ I do not mean a phenomenon causing problems of adjustment. I mean a challenge so far-reaching in its impact and irreversible in its destructive power, that it alters radically human existence. "

― Elizabeth Kolbert , Field Notes from a Catastrophe: Man, Nature, and Climate Change