A huge Earth Day thank you to everyone who participated and made Picnic for Earth a worldwide celebration. From D.C. to Afghanistan, over 12,000 nature-lovers celebrated Earth Day outdoors with good food and great company. More

Today's green news may inspire you to hop on your bike this weekend!

1. More than 500 cities in 49 countries now have bike-sharing programs. (TreeHugger)
2. Pea soup anyone? Algae blooms make for fascinating photos. (National Geographic)
3. In Australia, a common place to find koalas is in the hospital. The cause? Chlamydia. (BBC Nature)
4. Monkey see, monkey do. Like humans, monkeys and whales both react to peer pressure. (Huffington Post)
5. Pay attention, class: college campuses are teaching us how to build a clean energy future. (CleanTechnica)

There are a lot of beautiful sights in nature -- colorful flowers, lush forests, glowing sunsets -- but as this duck has learned, sometimes the most beautiful things are right in from of your face! We adore this photograph by Flickr photographer Rich Seeley of this curious Mandarin. More

Here are today's top green news headlines. And remember: everyday can be Earth Day!

1. How did you celebrate Earth Day? We're loving Grist's photo round-up. (Grist)
2. Facebook plans to cover it's 400,000+ square foot roof in trees. (The Atlantic Wire)
3. How cloned redwoods can help combat climate change. (LiveScience)
4. Americans less concerned about the environment than when Earth Day began. (Huffington Post Green)
5. It's getting hot out there: in 1400 years, the last 30 years were the warmest. (Mongabay)

Our favorite screech owls, Hoot n' Annie, have returned to their favorite owl box to lay eggs. We've set up a live camera to watch as the chicks hatch and grow up! More

Who's up for a game of Jenga? We're having a little fun with our Nature Photo of the Week. Robert Park Photography captured this spectacular image of Utah's Bryce Canyon National Park at sunrise -- careful, no one move! More

How will you be celebrating Earth Day? Tweet us your Earth Day plans and green tips -- and learn some new ideas for getting outside this weekend or on Earth Day, April 22. More

Green news! Get your green news here!

1. Glow-in-the-dark pavement is both (a) super rad and (b) saves energy. (Mother Nature Network)
2. Science as art: nanostructures form to create amazing visuals -- words don't do these pics justice! (Wired)
3. New species of porcupine found in Brazil... and it's already listed as endangered. (TreeHugger)
4. Easy as 1, 2, 3, 4? Slow sea-level rise by curbing 4 pollutants. (Discovery News)
5. New law protects leatherback turtle nesting site in Puerto Rico. (BBC)

On our radar today: wine, solar flares and cars that run on methane.

1. The secret is out: unknown population of orangutans found in Borneo (Live Science)
2. Wine vs. wildlife: climate change may send vineyards into prime wildlife habitat. (National Geographic)
3. Grab your sunglasses and see video of this morning's incredible solar flare. (Space)
4. Remember last year's huge drought? Scientists confirm it was not due to climate change. (Bloomberg)
5. Forget hybrids. Russia sees potential in natural gas cars. (NY Times)

Take a mirrored lake, add in fiery orange larches, a vivid blue sky and and you've got yourself the perfect formula for a stunning photograph. Thanks to Flickr photographer mountains43 for sharing this photo through The Nature Conservancy’s Flickr group. More