A new study from the University of Colorado and the National Oceanic and Atmospheric Administration says a low-carbon future is within reach of U.S. policy makers. 

The path there would require power grid upgrades researchers call an "interstate highway for electrons."

"There is a potential right now to build a system that has 80 percent reduction in the amount of carbon dioxide by 2030," said Alexander MacDonald, who co-authored the work.

That system would deliver renewable energy over longer distances. That'd make clean power  reliable even as weather cuts off some regions from wind and sunshine.

The price would be $2.6 trillion, but the scientists say savings would cover the costs.