Christian Science Monitor: Progress towards a more sustainable world energy supply has stalled, according to two separate studies released Wednesday.
Despite significant growth in wind and solar, the average unit of energy emits about the same amount of carbon dioxide as it did 20 years ago, according to the International Energy Agency. That's largely because the continued growth of worldwide coal use offsets regional gains in renewable generation, the authors say. A separate Pew study finds investment in the clean energy...