earth day

With environmentalism being so hip and fashionable these days -- particularly on the corporate level -- every day kind of feels like Earth Day. Every other ad I see on TV is from some polluter-cum-born-again-environmentalist company touting its commitment to our planet. Every other news story concerns a company or municipality taking new measures to reduce its impact on Ma Nature. Everywhere I turn, I'm being force-fed tips on how to "green" this and how to "green" that. The message, and more specifically the word "green" itself, have become so saturated that they're practically meaningless.

PopSci is celebrating Earth Day in all kinds of green ways! Check out our gallery to see what we're doing for the planet today, and to discover the science behind our decisions.

We just live on Earth; the GeoEye-1 satellite orbits it 15 times a day, 420 miles high, at 16,800 miles per hour.

Here are some dazzling photos from its ultra-high-resolution spaceborne camera.

Earth Day is a big deal here at PopSci. It's a time for admiring our incredible planet, and for giving back-- to the Earth, and to our readers (that means you). We've teamed up with the BBC to bring you a gallery of stunning images from the popular Planet Earth series, video clips (so you can appreciate the full affect), and our most extravagant giveaway yet.