A leaky pipeline has spilled about 1 million gallons of saltwater near a North Dakota reservoir that supplies drinking water to the Fort Berthold Indian鈥�

After a Noble Energy storage tank that spilled 178 barrels -- about 7,500 gallons -- of oil into the Poudre River was discovered June 20, questions arose鈥�

Two studies led by researchers at Colorado State University found that emissions of methane 鈥� a potent greenhouse gas 鈥� vary widely, and that leaks from鈥�