Carrying on as usual carries enormous risks, condemning today's students to a world of constant insecurity and frequent catastrophes.

Stopping emissions growth represents the most minimal of do-something responses.

It's going to be like herding stray cats, and the political leaders who can do it will be remembered as the same kind of geniuses who pulled off the American Revolution.

Since Serengeti-scale savanna scenes are only one or two million years old, our earliest after-the-apes ancestors didn't move into this scene so much as they evolved with it, as the slower climate changes and uplift produced more grass and less forest.

If we don't start thinking big about the CO2 problem, we may miss our opportunity to stop a climate runaway that will trash the habitable parts of the earth.

Anyone who would tackle our current addiction to fossil fuels is going to have to maneuver around denial.

Even if we stop the growth, we'd still be adding a constant amount of fossil carbon to the atmosphere each year.