These sand "castles" are not your usual holiday beach creations.

Wave power is the oft-forgotten cousin of solar and wind power. It has huge potential, but it is not quite as far along as the better known sources of clean power, so it tends to be overlooked.

This promising source of clean energy is facing an uphill battle.

The agency is offering up open source modeling software to scientists, engineers and garage inventors too.

The new wave energy harvester will be utility scale and tough enough to need little maintenance, even in rough seas.

Todd Litman calls the war on cars a bad joke. He gives us a lot of ammunition in the fight to end it.

While we've seen many celebrities jumping on the green bandwagon, we've also seen them doing it for the real deal. Many have been eco-conscious for years--some are just realizing how important it is to promote a sustainable

After a storm hit Tennessee last Sunday and Nashville saw record-shattering rainfall, the Cumberland River swelled to overflowing and the city experienced an epic flood. As soon as it was safe, residents were out

From a $50,000 portable recycled house to a tiny green egg house for Chinese students, TreeHugger has already offered plenty of posts that prove that green living doesn't have to mean high-end LEED certified luxury.

TVA and reactor-maker Babcock and Wilcox have agreed to work together to see if they can build up to 6 "small reactors." Nuctuplets, then? They can knock these

Would you let corporations decide how climate science gets taught in your kids' classroom? That's what's happening in Tennessee.

Backyard chickens may be trendy, but in some cities they are still illegal. But that doesn't stop some would-be chicken keepers.

Having trouble breathing? It may be because of where you live. The 2012 Asthma Capitals list is out. Is your city on the list?

It may be old, dirty and coal powered now, but it was once a vision of a brighter future, was a giant stimulus project and helped win WWII.

Who could possibly complain about brutalist architecture especially when it's framed with flowers

It was actually introduced to save fuel, but there have been unintended consequences.

Building new roads has been a major contributor to the city's unsustainable growth, newly released Landsat photos show, but more of the same appears to be on the horizon.

The Architecture Foundation of British Columbia issues a challenge: Design a four-person home made entirely of materials from a 100-mile radius around Vancouver.

Thousands of pairs of unwanted eyewear are collected and transformed into a unique, twinkling facade for an Istanbul museum.

This compact shelter is a place for a family to spend their summers in the middle of nature.

Why are we eating cardboard-like cereal and bland yogurt when we could be having a sensational meal?

We here at TreeHugger recently announced that the Carnival of the Green will now include a Twitter section.You can still submit as normal via email, of course, but this new part of the Carnival will be called "Best Green Tweets." So, if you use Twitter

We here at TreeHugger recently announced that the Carnival of the Green will now include a Twitter section.You can still submit as normal via email, of course, but this new part of the Carnival will be called "Best Green Tweets." So, if you use Twitter

We here at TreeHugger recently announced that the Carnival of the Green will now include a Twitter section.You can still submit as normal via email, of course, but this new part of the Carnival will be called "Best Green Tweets." So, if you use Twitter

We here at TreeHugger recently announced that the Carnival of the Green will now include a Twitter section.You can still submit as normal via email, of course, but this new part of the Carnival will be called "Best Green Tweets." So, if you use Twitter

We all can't go to Copenhagen this week, but there are so many ways to make our voice heard nonetheless. ThisPlace09 is an art and Twitter project that conveys personal thoughts about climate change to the delegates and the

This week marks Carnival of the Green #206, and it's being hosted by Daily Mitzvah, a blog hosted by Jen X. Jen is a teacher, historian, radio aficionado, and endlessly curious about all things uplifting, quirky, and off the main highway.

Today there was new space added to the Twitter HQ, doubling their size. Designed by the lovely and talented Sara Morishige Williams (@sara), the newest spaces are consistent with the philosophy of the existing offices

Who says you have to be human to be a popular user on Facebook and Twitter? These six animals have more friends, fans, and followers than most people.

A "moot court" will be held over Twitter for the first time ever, and students from 5 major Canadian law schools will argue an environmental law.

Come one, come all, witness The Twittertape Machine that prints a feed of your tweets and mentions on Twitter.

The organic snack bar company has created the first geo-location Twitter campaign to promote its trail mix bar.

To promote their fantastic garden grant program, Seeds of Change is bringing a seed vending machine and photo booth to several US cities, where visitors can tweet for seeds.

There are a number of reasons why this is an excellent idea.

We still have to reduce our carbon emissions.

Ever since we took the kids to Florida, my wife has been saving photo memories in scrapbooks. Our two daughters like making the books, too, and I have to admit, looking at one of these handmade creations beats Flickr any

See fish in black and white, bones and flesh, in Smithsonian exhibit, touring the U.S.

This adorably confused hen thinks she hatched a litter of kittens on a farm -- and proves hens and cats can co-exist.

You can see these magnificent photo portraits of Londoners on a wall or on the web.

Check out these amazing MRI images of our favorite fruits and vegetables.

Is there somewhere you go to when you need to recharge your batteries? Or remind yourself of the beauty of nature? These are our favorite nature spots.

Is there somewhere you go to when you need to recharge your batteries? Or remind yourself of the beauty of nature? This is the second part of this series.

I'm hunkered down in Brooklyn waiting for Hurricane Sandy to pass. Curious about what is happening nearby, I'm looking for photos of the flooding. Here's what I've found so far.

Everywhere you look for the next week in London there is an arty billboard.

" It is an idea upon which our planet’s future depends."

If there's one thing that can't be said of Elon Musk, it's that he doesn't try his best. Few entrepreneurs succeed in just one of the many difficult fields that he's tackled, but it's almost unprecedented to see a single person attack on so many fronts.

The theme of this year's conference is "the next chapter," and each attendee will receive a sample of what could be next in anti-counterfeit technology.

The new vision promotes active transportation like walking and biking.

Leave it to the Swedes to combine physical fitness with PICKING UP LITTER!

Now that's an infrastructure project!