Tracy Stanton, Executive Director of the Emerald Alliance 

A new study conducted by researchers from the Nature Conservancy, NASA, and Stanford University examined urban tree cover in 97 U.S. cities and applied their findings across the entire U.S. urban population. Reported to be one of the most comprehensive studies on the impact of heat in cities, the study quantified the connection to human health and electrical demand in terms of cost savings estimated at up to $12 billion each year.

Read a summary of the findings (by Linh Anh Cat, in Forbes.com).