If I could just add a comment to Mr. Marston's question about clean tech and build on what Tom has said, if you look at public policy in the United States and in other jurisdictions, including China and the European Union—but let's focus on the U.S.—the U.S. under the Obama administration is committing multi-billions of resources to clean-tech ventures of one sort or another. The last number I saw was $85 billion. We're not quite there yet, to say the least.
I know of two funds that in the past two years have tried to raise dedicated clean-tech funds from investors, and they gave up; they just stopped, because they couldn't raise the money. There's one more out there right now that launched back in September--has not been public--and they're trying to raise $200 million. We'll see if they can do it.