an equivalency. Energy use world wide is at an all time high and growing with the population. We will end up using coal in the end and the necessity of energy use will trump global climate change. Many who were once advocates of clean energy change after examining the facts. There was one of these converts on PBS the other night who was saying the same thing. If you look at enough pie charts concerning fossil fuel use compared to clean energy use you can see the enormous and impossible challenge it really is. There's no way to stop the train that has left the station a long time ago. I wish it was not so but then I'm on my way out in the next ten to 20 years.