He wanted to reduce CO2 levels by not giving a speech and playing golf instead:
President Trump’s withdrawal from the Paris Climate Agreement on Thursday prompted the administration to plan the “Pittsburgh not Paris” rally at the last minute across from the White House. However, Trump himself was not in attendance.
Instead, the president’s motorcade was seen pulling up to Trump National Golf Club in Sterling, Virginia, on Saturday morning, according to reports. It’s unclear at this time if Trump is playing golf or just visiting his golf course. However, this does make it the 22nd time that he’s visited a golf course during his term in office.