'Energy scavenging' draws on a wide array of untapped energy sources – radio waves, vibrations created by moving objects, waste heat from computers or car exhaust systems — to generate electricity.
Natural gas is cleaner than coal, but only if the industry can control its methane releases. A new report says it's doing OK, but methane releases are underestimated.
It was raining again in Colorado Sunday, adding to flooding and making search and rescue operations difficult. Federal teams have joined state and local efforts, and FEMA administrator Craig Fugate goes to Colorado Monday.