Coal has fueled our economy for generations. We've used it to heat our homes, drive our trains and power our grids. Hotter summers pushed many countries away from this burning rock. But some depend on coal for their energy, their industries and their livelihoods. And they're finding it hard to let go. We'll mine how they can mitigate the damage, ease their dependence, and move on to more sustainable sources. Host: Catherine Kobayashi Guest: Greg Dalton, Journalist and Host, "Climate One"