We got into an interesting group discusion once at a night class at Purdue, The prof stated that once an event occurs that is a problem, there are no simple solutions.What Geo says about nuclear power plants is right on, its a relativly safe power source, if handled properly, the problem, waste. What do we do with it?No simple answer. Refinerys, none built in years, he's right, why? Maybe transportation. We had 7 refinerys in east chicago indiana, now only one. Feed stock, oil comes from the gulf either by off shore or by super tanker, pipelines carry it inland.Pipelines need maintanence, that in most cases is costly. But I degress, remember acid rain? It started effecting pine forests and lakes in the north east, coal was the culprit, sulpher dioxide, rain, acid rain. So we almost cured that problem, BUT if we would have not done anything, we would have eliminated the pine bark beetle, that is destroying pine forests.