The 100% clean energy movement has swept the United States. Over the last six months, dozens of cities including Chicago (population 2.7 million+) have joined New Mexico, Washington State, Puerto Ricoand Washington D.C. in passing mandates that set a timeline by 2050 or sooner for utilities to entirely phase out fossil fuels in their electricity supply.

This brings us to the point where one in five Americans live in a jurisdiction that has passed such a policy. And with five more states considering legislation to do so, advocates say that this is just the beginning.