How much is left?
Continuing on yesterday's "only one planet" cool Web-video theme, our colleagues at Scientific American have a very snazzy interactive Web gizmo called "How Much Is Left? The Limits of Earth's Resources." (For those annoyed by snazzy interactive Web gizmos, there's a companion piece in the print edition, but you gotta pay for it.) How long will the glaciers in the Alps last? The world's supply of copper? Orange roughy? The navigation is not always intuitive, but poking around is well rewarded.
Oh, and one they missed that's coming up in the next (November/December) issue of Sierra: helium. Yes, we're running out, so keep those party balloons tied firmly to your wrist.