No matter what Donald Trump says, it's clear that global warming is rapidly changing conditions on our planet.

Most of us live in parts of the world where we don't expect to see much, and we wouldn't necessarily notice things that are crashing.

People tend to focus on the here and now. The problem is that, once global warming is something that most people can feel in the course of their daily lives, it will be too late to prevent much larger, potentially catastrophic changes.

Humans will eventually become extinct. People treat that as a radical thing to say. But the fossil record shows us that everything eventually becomes extinct. It depends what "eventually" means. But the idea that were going to be around for the rest of global history...I don't think there's any scientist who would suggest that is true. It could be millions of years from now. We may leave descendants that are humanlike.

Though it might be nice to imagine there once was a time when man lived in harmony with nature, it’s not clear that he ever really did.

No matter what Donald Trump says, it's clear that global warming is rapidly changing conditions on our planet.

Somewhere in our DNA must lie the key mutation (or, more probably, mutations) that set us apart—the mutations that make us the sort of creature that could wipe out its nearest relative, then dig up its bones and reassemble its genome.