Judy Woodruff:

Now, as the Trump administration is considering whether to put tariffs on solar panels made outside the U.S., the rapidly plummeting price of solar panels has led to a boom in rooftop installations and jobs.

The solar industry now employs almost three times as many people as the coal industry. This growth is also raising questions about how utility companies should respond.

William Brangham is back with this report from Vermont. It is part of our occasional series of reports Peril and Promise- The Challenge of Climate Change.

It's also our weekly look at the Leading Edge of science and technology.