Workers Stephen Janota, left, and Matt Bart, install Solar Service Inc. photovoltaic (PV) solar electric panels on the roof of a home in Park Ridge, Illinois, U.S., on Tuesday, Sept. 10, 2013.
We independently review everything we recommend. When you buy through our links, we may earn a commission. Learn more› By Tim Heffernan Tim Heffernan is a writer who covers air and water quality and ...
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