A major utility with operations in eight Western and Midwestern states is vowing to sharply cut greenhouse gases over the next decade and eliminate all carbon emissions by 2050, expanding on moves by other utilities in the region to quickly drop coal despite the Trump EPA's ongoing efforts to rescind Obama-era climate rules and encourage new coal plants. Minneapolis-based Xcel Energy, which serves parts of eight states -- Colorado, Michigan, Minnesota, New Mexico, North Dakota, South Dakota, Texas and Wisconsin...