This is interesting because of motive. People probably don't realize this but Shell and BP are the biggest producers of solar and wind products in the world. With them exiting the market, I bet it's because they can't get the margins that they thought they'd get because of all the newcomers into the market. Biofuels are a smarter investment IMO, but carbon sequestration is a technical hack.

Slashdot | Shell Ditches Wind, Solar, and Hydro