When faced with conclusive evidence of a major threat to citizens, a true leader would do everything possible to confront it. So, what was the U.S. president’s reaction to a U.S. scientific report compiled by more than 300 scientists and endorsed by a dozen different agencies, including NASA, NOAA and the defence department, that warned climate change poses a dire threat to the American economy, way of life and human health? “I don’t believe it,” Trump told reporters.