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

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.

Our CO2 mixes with everyone else's within a year, then hangs around for centuries like a shroud.

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

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

Perhaps we should put up posters in such places reminding people that where they stand was underwater the last time that the Earth ran a 3°F fever.

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