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.

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.

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

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.

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

Trusting your energy policy to the fossil fuel lobby is like trusting your health care system to the tobacco lobby.

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