On an evolutionary scale, it is very difficult to know what our intervention will do to the level of diversity on the planet - but there is a vast amount of evi

On an evolutionary scale, it is very difficult to know what our intervention will do to the level of diversity on the planet - but there is a vast amount of evidence to suggest that climate change causes mass extinctions. Certainly the ice age did. Mass extinctions reduce biodiversity. We're already part way through the latest mass extinction event, which began soon after humans arrived on the scene: http://en.wikipedia.org/wiki/Holocene_extinction http://en.wikipedia.org/wiki/Holocene_extinction Since we have reached a level of self awareness which allows us to consciously limit the damage we do, why not try to preserve diversity where we can? Each organism that becomes extinct represents a loss of information about one particular form of life. They're like books in a big, awesome library, and we're burning them to keep warm.