United Nations Secretary-General Ban Ki-moon says he hopes Donald Trump will shift course on global warming and "understand the seriousness and urgency" of addressing the problem.

Ban said Tuesday that "as president of the United States I'm sure that he will understand this, he will listen and he will evaluate his campaign remarks."

Trump has called global warming a "hoax" on social media and pledged during his campaign to "cancel" the landmark Paris climate agreement adopted last year.

Speaking to reporters at his last U.N. climate conference as secretary-general, Ban said he's sure the president-elect "will make a good, wise decision and I'm going to discuss this matter more in person."