Hillary Clinton said the U.S. will participate in a $100 billion annual aid fund to pay developing countries for carbon reduction—but only with transparency
The $3.4 billion injected Oct. 27 is a small down payment on the cost of equipping the U.S. electrical system with smart meters, batteries, and sensors
One of the bright spots at the Copenhagen climate change summit could be the establishment of a scheme to protect forests and their carbon-absorbing capacity
A group of Europe's largest commpanies urged leaders not to agree to stiffer carbon emission targets unless the U.S. and other countries also raise their goals
The mainland earns billions in carbon-offset sales. But by taking credit for projects that would have been built anyway, it may not be playing by the rules
Technology from the Soviet space program adapted by Israeli and German scientists may offer a safe way to deliver the volatile gas to power laptops and cars
BusinessWeek and GreenBiz.com have assembled a list of 25 intriguing energy startups, including young companies that tap geothermal heat, turn waste into biodiesel, and more