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A top adviser to President Obama chastised environmental groups for criticizing the president’s energy policy, arguing in a letter that Obama “has been leading the transition” to low-carbon energy solutions.

John Podesta, a former chief of staff to President Bill Clinton who rejoined the White House at the beginning of the year, wrote in a two-page memo obtained by the Washington Post that the president “believes it is imperative that we act to address the threat of climate change.