It's not whether or not individual members of a species can survive if it's a little hotter. The problem is that climate change is destroying entire ecosystems

It's not whether or not individual members of a species can survive if it's a little hotter. The problem is that climate change is destroying entire ecosystems in which these individuals exist. A polar bear can do ok in a zoo in San Diego, but polar bears will go extinct once their habitat in the Arctic disappears.