sugarcane ethanol, an educator resource.

This documentary touches on a variety of topics, though I found the treatment of Brazil’s biofuel program to be particularly worthwhile.

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volcanoes.

Gain a new perspective on earth science with a look at volcanoes through the eyes of Werner Herzog.  In typical style, his foray into this topic goes beyond plate tectonics and molten rock; it’s somehow more of a film about the human condition than anything else.  From tribal rituals to North Korean propaganda, this tour exposes how our dynamic planet shapes our lives.  Here’s the trailer.  It’s worth a view: