He's Nobel prize winner (in physics) and now Energy Secretary Steven Chu.
Better than anyone in the Obama administration, he understands the need and urgency to pursue renewable resources. Unfortunately, he's not so keenly attuned to Washington politics. Embittered John McCain recently skewered him about Yucca Mountain.
Here's an amazing talk that he gave a while back about climate change. 9 minutes long. (Listen to the part about refrigerators. He used an anecdote about how government regulations forced refrigerators to become more efficient. They started using one fourth of the energy, and the price of refrigerators dropped by half.)