By Vincent Valk – Special to CNN
Let us suppose, for a moment, that it were somehow possible to remove the greenhouse gas emissions of 300 million automobiles around the world – without actually removing any automobiles.
How would we go about doing this? A massive cash-for-clunkers style program in which everyone gets hybrids? A vehicle-miles-traveled tax? Something involving solar and wind farms?
No – we can paint our roofs white.