World Science Podcast, July 17, 2009: For global warming, is China a villain or a hero? Plus, a biofuel debate in Europe, the science of horseracing, and a link between cursing and pain.

Summary: World Science Podcast, July 17, 2009: For global warming, is China a villain or a hero? Plus, a biofuel debate in Europe, the science of horseracing, and a link between cursing and pain.