Obama has made fighting climate change a top priority in his final two years in office.
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U.S. President Barack Obama will sign an executive order on Thursday that sets a goal for the U.S. government to cut its greenhouse gas emissions by 40 percent by 2025, the White House said.

Although the federal government accounts for only 0.7 percent of net U.S. emissions, it is the single largest energy consumer in the United States, according to the White House.