Dave Levitan

Intermittency has long been considered the Achilles heel of renewable power generation.

Small hydropower projects have the potential to bring electricity to millions of people now living off the grid. But experts warn that planners must carefully consider the cumulative effects of constructing too many small dams in a single watershed.

Researchers have long contended that power from ocean waves could make a major contribution as a renewable energy source.

After years of delays and legal battles, several offshore wind projects seem poised to be launched off the U.S. East Coast.

A move by New York City to begin collecting food scraps and other organic waste is just the latest example of expanding efforts by municipalities worldwide to recycle large quantities of unused food and slash the amount of material sent to landfill

Urban stormwater runoff is a serious problem, overloading sewage treatment plants and polluting waterways. Now, various U.S. cities are creating innovative green infrastructure — such as rain gardens and roadside plantings — that mimics the way nature collects and cleanses water.