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The Air Force approves a blend of plant-based fuel with jet fuel for the first time, saying performance for pilots will not be affected.
Biofuel start-up Cobalt Technologies says it's found a way to make biobutanol with wood from forests ravaged by pine beetles.
Cobalt Biofuels opens plant in California to produce biobutanol from wood waste as other big names also invest in the non-food based biofuel.
Ideas for new materials to reduce electronic waste, a critical look at green guru William McDonough, digging into Blacklight Power's clean energy claims, funding for wind projects dries up, Wal-Mart and Duke Power duke it out of solar plan.