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The ocean harbors abundant energy in the form of wind, waves and sun. All of these could be sampled on something called an Energy Island: a floating rig that drills for renewables instead of petroleum.

Here's a wave power technology which you may not have heard of: It's called the Searaser and (though only in prototype stages, I've got some reservations about how well it may scale up, as well as the name which somehow I always see as 'Sea Eraser') it may be worth watching. The principle is fairly simple and proven in a different context: Use the Searaser to pump quantities of sea water up a hill where it can be stored in ponds until needed and then released downhill to drive hydroelectric turbines to create power. This is how the Searaser works:

The world is finally doing something about climate change. People are changing their light bulbs and buying hybrid vehicles. Renewable energy is gaining ground. But is this enough? Policy-makers insist that environmental responsibility not come at the expense of economic growth. Massive populations in China and India are playing catch-up with America's consuming and polluting ways. And on a planet biologists believe can only support a few billion humans over the long haul, our population is near seven billion and continuing to rise. Will our efforts to save the planet be nullified by our worship of growth?

While still a small percentage of overall electric generation, there's no denying that wind power has been growing consistently in the United States. In 2007, an additional 5,329 megawatts of capacity was added, an amount which was slightly more than a quarter of all new global wind capacity that year. Currently an additional 8 gigawatts of wind capacity is under construction and scheduled to be operational by the end of 2008. The result: This will be the third straight year that the United States leads the world in annual wind power installations, according to a new study by Emerging Energy Research.

Scientists mimic essence of plants' energy storage system. In a revolutionary leap that could transform solar power from a marginal, boutique alternative into a mainstream energy source, MIT researchers have overcome a major barrier to large-scale solar power: storing energy for use when the sun doesn't shine.

While certain American politicians complain about a million bucks being included in the country's energy plan to promote bikes, in the UK they are investing £140 million (about US$ 280 million) to create dedicated bike lanes, provide bike parking, safety training, on-street bike rental networks and a campaign to promote bicycling in 12 Cycling Demonstration Towns.

The incandescent lightbulb that wastes 90% of the electricity as heat is dying, we all know that. But a new breakthrough in solid state lighting might also kill compact fluorescent lightbulbs (CFLs) faster than some expected. Scientists at Purdue University have figured out how to manufacture LED solid-state lights on regular metal-coated silicon wafers (more details below). What this means is: much lower costs.

I used to be a strict modernist; my role at TreeHugger was to demonstrate that green design could be wonderful and cool and I filled the site with all kinds of modern houses with some claim, often weak, for being green. Those houses became less common on the site in recent times, as I worried more about house size, the appropriateness of single family dwellings on big suburban lots, and trying to reconcile my love of clean, modern design with my concern about the use of fossil fuels or building materials that cannot be maintained in a world made by hand.

Despite an unstable regulatory environment-renewable energy tax incentives are stalled in the senate, BLM policy has been inconsistent- the United States will surpass Germany to be the largest market for solar power in the world by 2011, according to a report by JP Morgan, cited in Greentech Media. By 2011, the US will have an installed capacity of 1.6 gigawatts (with 920 MW in California alone), surpassing Germany's expected capacity of 1.35 gigawatts. The third largest market by this time will be South Korea with 957 megawatts of capacity.

If Corus Group, an Anglo-Dutch steel manufacturer, has its way and their new work into developing solar cell paint comes to pass, the whole concept of what types of material can be used for generate electricity through photovoltaics could change. At least that's the promise. Renewable Energy World is saying that production on Corus' solar steel sheets could begin in three years, though doesn't really go beyond that in terms of timelines. The way it would work is this:

From Holland, the country famous for its windmills, comes a new design for home wind power. Looking like an eggbeater, it spins quieter and at lower wind speeds than a lot of traditional propeller-type turbines. It's now standard for big wind turbines to have propeller blades. Much of the turning force is generated at the tips, which slice perpendicularly through the air, causing a swooshing noise that some residents nearby have said they find unnerving.

Visitors to Rehoboth Beach, Del., soon may be greeted by more than sand dunes, seagulls and beach umbrellas. If offshore wind advocates have their way, scores of 140-foot blades will be spinning in the ocean breeze nearly a dozen miles away, barely visible to the sunbathers.

The City Council on Wednesday became the first in Ohio with a plan to channel grants and loans to residents and businesses to replace tar and shingles with vegetation. Supporters of the idea want to see Cincinnati become a leader in green roofs, a European-born movement that has spread to only a few U.S. cities, including Chicago, Milwaukee and Seattle.

Our Renewable Nation is possibly the most adorable project ever conceived to advocate renewable energy. It's an eco-video project helmed by the McCullough family, who are traveling across the country in a vegetable oil powered VW Beetle. They're visiting wind farms, solar installations, talking to companies developing sustainable technologies, and documenting all their interviews and travels on video. Each of the videos stars 9-year old Carrick McCollough, the cutest kid to campaign in the name of renewable energy. And it's effective. Don't believe me? Just watch the video after the jump, where Carrick implores grownups to not blow it for him and his generation. How can we say no to this?

Part of creating the ultimate sustainable planet will be our ability to find sustainable energy sources in a variety of means, such as sunlight, water flow, wind, and yes, even rain. We are of course speaking of the kinetic energy which can be harnessed from rain, which up until a few months ago, was not being considered for use in a consumer product... Lightdrops Umbrella This kinetic energy is created from piezoelectric material, which is able to convert mechanical energy into electrical energy. Now, we aren't talking about a whole lot of energy being created here, approximately 1 microwatt to 12 milliwatts per rain droplet. While not much in the large scheme of things, this technology has been put to use in a new LED umbrella called Lightdrops, which is able to self power an internal LED light using the rain from which it is protecting its user from.