Are you saying there was no usable energy source before coal and oil? So sails never contributed to mankind? Water wheels were myths?, and wind mills are a new contraption made to kill birds. Fossil fuels were a great contribution, but still renewable energy has a place.I'm all for using it, because I'll be gone before it is. I also worked indirectly for the oil refinerys, and many of my family worked the refinery route.I got ahead of myself, I'll continue to use as much fossil fueled energy that I can.BUT MAN DOES HAVE AN IMPACT ON THE ENVIREOMENT.[what ever]