Forcasting solar power?????

I was amazed at 50 minutes into the film, Stewart is talking to his girlfriend on a park bench about the sun's energy turning the grass green and how he hoped someday the world would find a way to make more use of the sun. I was totally amazed, and astonished! Here is the quote:

“[This college friend and I had an idea.] We…we wanted to find out what made the grass grow green. Now that sounds silly and everything, but it’s the biggest research problem in the world today and I’ll tell you why [and he doesn't even mention Iraq!]. Because there’s a tiny little engine in the green of this grass, and in the green of the trees, that has the mysterious gift of being able to take energy from the rays of the sun and store it up.

You see, that’s how the heat and power in coal and oil and wood is stored up.

Well, we thought if we could find the secret of all those millions of little engines in this green stuff, we could make big ones. And then we could take all the power we’d ever need right from the sun’s rays, you see?“