The sole purpose of attempting to slow global warming is to make things a bit more comfortable for ourselves. This is the same reason we work to preserve species--we do not know what value their unique genetic combinations might prove to have in the future, and it's VERY clear we don't understand ecosystems well enough to recognized keystone species. Loss of ecosystems will change the climate and devastate our food supply.

And, oh yeah--some of us LIKE ANIMALS. That is why we keep them, after all.