The CEO of America's third-largest coal producer has penned a letter to President Donald Trump urging him to stay in the Paris climate deal.
"U.S. leadership could take the world into a new era of global economic prosperity that also addresses concerns about climate and emissions."—Colin Marshall, CEO of Cloud Peak Energy
Why it matters: It's the latest sign of broad corporate backing for the pact, which Trump said on the campaign trail he would withdraw from. Big oil companies, including ExxonMobil, have also called on the president to stay in the deal.