Rating is available when the video has been rented.
This feature is not available right now. Please try again later.
Published on Apr 15, 2012
It's true that Earth's a massive jigsaw puzzle, with lots of pieces intricately fitting together. But, Richard Alley argues, we already know enough to see the Big Picture. The missing pieces of scientific understanding - exactly how clouds work, how extreme weather will change with global warming - are important, but we can already see how Earth works.