The past eight years have created a strong record of growth for clean energy technologies that reflects President Barack Obama’s energy policies and the market conditions they encouraged. A rooftop is ...

Millions of Americans head outdoors in the summer, whether for a day at a nearby lake or a monthlong road trip. For environmental economists like me, decisions by vacationers and outdoor recreators ...

For years, Salt Lake City has offered free parking to residents who have moved from standard gas powered cars to cleaner models. And the program has worked — though a little too well in recent years, ...