Chu launched the "Low Carbon Communities of the Americas" program at an event on energy and climate change that was put together after presidents at the Fifth Summit of the Americas in April agreed to collaborate more on green energy issues.

Using a mobile phone-based software program has enabled a test group of Volvo employees to cut the greenhouse gas emissions of their daily commute by more than 30 percent.

It is not an exaggeration to say that the team that President Barack Obama appointed to promote his green agenda is nothing short of outstanding

A bigger role must be found for improving energy efficiency in any new U.N. deal aimed at reducing greenhouse gas emissions, a leading China-based project developer said on Thursday.