Yale Environment 360: If the United States and the world community hope to avoid the worst effects of climate change, solar power will have to play a pivotal role in electricity production. The technology is quickly maturing, and the price of solar panels has plummeted to the point where new utility-scale solar installations are a sound investment, cheaper than new coal plants and frequently competitive with natural gas. In 2014, solar power accounted for almost a third of all new U.S. electric generating capacity. If...