"Deploying today’s renewables and improving transmission couldn’t be more important. . . . Unless we use large amounts of nuclear energy . . . every path to zero {net emissions} in the United States will require us to install as much wind and solar power as we can build and find room for. It’s hard to say exactly how much of America’s electricity will come from renewables in the end, but what we do know is that between now and 2050 we have to build them much faster - on the order of 5 to 10 times faster - than we’re doing right now. And remember that most countries aren’t as lucky as the United States when it comes to solar and wind resources. The fact that we can hope to generate a large percentage of our power from renewables is the exception rather than the rule. That’s why, even as we deploy, deploy, deploy solar and wind, the world is going to need some new clean electricity inventions too."