My "green home" is yellow, pale yellow. In the Mediterranean environment of Southern California, dark colors soak up more sunlight and turn it into heat. So where I live, a light-colored house is cheaper to run than a dark one. This wasn't my idea. The ancient peoples of Southern California and the more recent Spanish figured it out.

In our world, we use an astonishing amount of energy. It is sobering to consider that a world-class cyclist, using even a 100%-efficient mechanical-to-electrical-conversion...