A subsidiary of Berkshire Hathaway is making a $230 million investment in a Chinese battery company that's developing environmentally-friendly cars to be sold around the world.

A New Jersey company wants to use wind turbines to produce compressed air that can be stored underground or in tanks and released on demand to power generators.

Fascination with wind turbines small enough to mount on a roof is spreading from coast to coast, even if the economics may make little sense.

Colleges and universities are making sustainability a priority. Here's the 25 greenest, according to Kaplan.

Big cities have big trash. But in California, Norcal is transforming much of that trash into profit as the recycling company expands to include construction materials and composting.