Breitbart News reports that former President Barack Obama planned to criticize former President Donald Trump, who famously withdrew America from Obama’s Paris Climate Accords in 2017, in a speech on Monday to the COP26 summit in Glasgow, Scotland.

Obama will blame the “rise of nationalism and tribal impulses around the world,” for hurting the global response to climate change, blaming “a lack of leadership on America’s part for four years on a host of multilateral issues,” according to a preview of his speech. He will slam the “America First” President for “four years of active hostility towards climate science.”

“[T]here are times when I feel discouraged, when the future seems bleak, and I am doubtful that humanity can get its act together before it’s too late,” Obama plans to say. “And yet, whenever I feel such despondency, I remind myself that cynicism is the recourse of cowards. We can’t afford hopelessness.”

Obama will also send a message to the youth, urging them against alienating adults from the urgency of their message on climate.

“To change those folks, we can’t just yell at them, or tweet at them, or inconvenience them by blocking traffic through protests,” Obama will say, urging young people to “listen to the objections and reluctance of ordinary people.”

Good luck getting climate change activists to listen to the objections and reluctance of ordinary people.