Patriot-News: Over the last two months the U.S. Congress has been engaged in a great operatic drama over what many have called the worst environmental disaster in U.S. history: the BP Gulf oil spill. Although oil leaking from the Deepwater Horizon drilling platform site might be creating the greatest environmental and economic harm in U.S. history, there is new evidence that another looming environmental problem is likely to produce far worse environmental and economic impacts not only for the …