FILE - In this Feb. 25, 2016, file photo, a truck carries a load at the Nucor Steel plant in Seattle. Even as the Trump administration seeks to roll back Obama-era rules to curb greenhouse gas emissions at coal-fired power plants, Washington state is forging ahead with its own rules to cap carbon pollution from big industrial facilities. But the state faces legal challenges as it begins requiring large polluters such as Nucor Steel. (AP Photo/Elaine Thompson, File)
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