In 2007, the amount of solar power installed in the U.S. was 1.1 gigawatts (GW). As of 2017, that amount has increased to 47.1 GW. Enough to power 9.1 million average American homes. If you're thinking "we've still got a long way to go," you'd be right. On the other hand, increasing installed power by 4300% deserves some attention. How'd we do it? The Department of Energy played an important role. In 2011, they initiated a program called The SunShot Initiative. They set targets for the years 2020 and 2030, by which times generating solar power would have become more affordable. More affordable on a utility scale, more affordable on a commercial scale, and more affordable on a residential scale. Thus far, they've succeeded in hitting the 2020 goal for utility-scale generation. Needless to mention, they reached that goal three years early. The goals, it should be mentioned, don't take subsidies into account. It's the technology, in the case of uti...
Understanding the global-warming world: causes and ramifications.