The Earth intercepts a lot of solar power: 173,000 terawatts. That's 10,000 times more power than the planet's population uses. So is it possible that one day the world could be completely reliant on solar energy? The following video...

In this video segment adapted from ZOOM, visit a class as they design a city of the future that will use solar, wind, and water power to fuel its economy. [2:12]

Recently, Bill McKibben discussed an effort to return Carter-era solar panels to the White House. We'll get a report from him on his efforts.

This short video on photovoltaics explains what happens inside solar cells and solar panels. [1:11]

Explore how solar panels can be used to produce electricity. Watch kids use the scientific method to find out how the sun's position in the sky affects a solar car's performance.