BBC: It's been a bad week for efforts to develop green energy around the world.
A new report from the International Energy Agency (IEA) says that progress towards carbon-free energy production has basically stalled.
"Despite much talk by world leaders," said IEA executive director, Maria van der Hoeven, "and despite a boom in renewable energy over the last decade, the average unit of energy produced today is basically as dirty as it was 20 years ago."
The IEA uses a complex calculation called...