Nathan Lewis-"What does this mean for us and our planet?”

When it comes to the Lewis' lecture, he goes into detail about subjects concerning climate change. He brings up various percentages that have to do with how energy is measured and how it's used. (Where did he get these percentages)? It struck me that he wanted to switch to coal usage as much as he did. I think that coal is a inexpensive reliable source, but if we're so worried about climate change, then we shouldn't switch to it. I'd rather pay more for energy and live in a "clean" climate, rather than pay less and slowly die off.