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.

Unless we redesign our civilization in numerous ways, all of the science in the world won't save us.

Countries that innovate first get the new jobs, developing an economic edge over the C-free laggards that end up having to later import the technology.

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

Carbon-free energy is simply something we have to do. The time for talk is past. If we turn around net carbon emissions by 2020 rather than 2040, we get another 2° of fever rather than 3° - and that's a big difference.

The real focus needs to be on political action to stop this runaway train, real soon.

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