 This is Marketplace. I'm Kai Risdahl. There's an energy think tank over in the UK. It's called Ember Climate, which was out earlier this year with a bold and somewhat heartening prediction that the global power generation industry has officially passed peak greenhouse gas emissions. Power generation is, of course, responsible for more than a quarter of the emissions that are heating up the planet, burning coal mostly. And we have been putting ever more of those gases into the atmosphere since the Industrial Revolution.