Access to information, policy initiatives, advice, and analysis on issues of energy efficiency and renewable energy, from the U.S. Department of Energy. Its network is responsible for tracking the technological, economic, and...

ABC Da Energia describes the many ways that energy can be obtained and conserved. It explains different sources of energy, how each works, and how energy can be saved in our daily lives. Interactive energy-saving activities and games...

Electricity is considered a secondary energy source because it is generated from other sources such as water and wind. Learn about electricity demand in the U.S. as well as the challenges we face in the future to continue to provide...

You can link to the anatomy of El Nino, chasing El Nino, and El Nino's reach. There is a resource page and a search page.

This is a large collection of resources on cycles of nature and the Earth. There is a constant exchange of the elements between air, earth, water, plants, and animals. Most biological processes wind up back where they started. These...