Coal mines are losing the battle against renewable energy because of the plummeting prices of solar panels and wind turbines.
Texas and Iowa are two states ushering in the development of wind energy.
The U.S. is cutting down its reliance on coal energy.
Denmark's wind turbines are enough to power the country's electricity needs.
Renewable energy resources are expanding as scientists and startups harvest water from air, create Ubers of energy, and hold electric-powered formula races.