for a sense of the whole planetary scope of human activity (and its absence):
Matt Harding collected clips of his happy jigging all over the world.
This set this to music. A simple but powerful statement. It is hard not to smile.
For anyone interested in geography, energy - water - air/space, and the places around the world, this Flash movie is vivid and powerful. www.greatdanepro.com/Blue%20Bueaty [that spelling error is part of the link]