For the first time, wind energy is about as cheap to produce as energy fueled by coal. Thirty-seven states now have commercial wind energy within their borders.

More than half of American states have passed laws to reduce electricity consumption. Many have programs to help consumers insulate their homes and reduce energy bills.

International climate negotiations took a big step forward at COP-16. A key component of the Cancún Agreements is a new UN-led program for saving rain forests.