A look at the technology behind geothermal energy, an alternative energy source. Aired Aug. 15, 2008 [17:48]

A discussion of vehicles being tested in the market by major automobile makers, that run on alternative fuels such as hydrogen and electricity. Aired June 6, 2008 [12:47] Links to a short video about a Honda hydrogen fuel cell car.

An interview with Daniel Nocera at MIT about his research into creating artificial photosynthesis as a method of generating solar energy. One application would be to use it for a power generation system in developing countries. Aired...

Learn why photons, electric fields, silicon, and electrons are important when it comes to generating electricity from sunlight in solar panels. [1:15]

Learn about wind generators before you make a model windmill for yourself, watch it in action and then calculate its power output. [9:56]

A good argument for the use of wind power lays out both the benefits and the challenges of using this alternative energy source. [2:33]

Lisa Van Pay of the National Science Foundation visits scientists at MIT as they take on the hydrogen energy challenge. Hydrogen bonds are an extremely efficient way to store energy, and scientists would like to capture this energy....

Fuel can be produced from different types of biomass, such as algae and cellulose. These scientists are building an algae reactor, learning how leafcutter ants convert cellulose into sugar, and turning the waste from a sawmill into...

Explore how a smart grid will connect renewable energy resources to our existing power grid for more efficient energy sharing. These researchers are developing control systems that regulate electricity flow, and a device that regulates...

Scientists are investigating how to use a marine bacterium called Saccharophagus degradans in biofuels. [5:22]

Find out what obstacles still stand in the way of alternative energy sources. Jennifer Kurtz discusses the current state of hydrogen fuel technology.

Find out what wave energy is, and how it works. [2:17]

A video investigating how fuel efficiency is improved and emissions reduced in electric vehicles. [2:49]

Learn how oil could be harvested from algae in this video. [2:33]

A video exploring how energy can be harnessed from the ocean's waves, tides, and currents. Learn how this energy is converted to electricity to power our lives. [3:00]

A video exploring wind turbine design by looking at the impact of blades, blade shape, blade length, and tower height. See how all these variable affect the ability of the turbine to maximize power output. Site also includes an article...

Can a backpack light up with solar power? Watch as Deysi prototypes a backpack with lights powered by the sun from our Build it Better challenge. [3:50]

What is green alternative energy? Deysi goes on a scavenger hunt to explain and to find examples. [2:57]

Watch as Dan Sweeney travels to Uganda, and demonstrates how to turn waste into energy. [5:11]

Google, Good Energy, and other investors threw financial support behind an idea to build a multi-billion-dollar power distribution line for offshore wind farm projects. The company called it "a superhighway for clean energy," collecting...

At Arizona State University, students make and test new materials that can be used to build better and more versatile photovoltaic solar cells, and test solar cells to see how the shape of the surface affects the cell's energy...

Do you know why renewable energy sources are so important? Investigate hydropower, wind, geothermal, and solar power with this video. Also learn about some of the challenges with these energy sources, and how engineers are working to...

After pedaling for hours, Adam discovers there's a difference between the power you use and the power your body can generate. [3:41]

Sustainable energy is one of the greatest challenges for chemists today. This video discusses the research into possible solutions. [4:08]