Another obvious solution, painfully slow in the dawning! See, Roofs of big box stores key in shift to 100% renewable energy:
The U.S. has the technical potential to produce more than 100 times as much electricity from solar photovoltaic and concentrating solar power installations as the nation consumes each year. Given our abundant solar resources, America must take advantage of untapped opportunities to install solar technologies—like using rooftops of large superstores and “big box” retail stores as hosts for clean electricity generation.
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