What's the energy of the future?
Some hold out hope that renewables like solar and wind will win the day in powering the globe.
There's also a big nuclear contingent.
And yet others are convinced that the future of energy belongs to natural gas.
They're all wrong. The energy of the future is coal.
Peabody CEO Greg Boyce says it is expected to become the world's largest energy source, and has been the fastest-growing major global fuel.