Albert Gore Jr. must possess a bottomless wellspring of hope in his soul.

The former vice president told Stephen Colbert this week that he had hoped Donald J. Trump would change his mind regarding his decision to pull the United States out of the Paris climate change accord.

He has given up. The former VP says on Colbert’s late-night talk show that Trump is beyond redemption regarding climate change, which has been Gore’s signature issue since leaving the vice presidency in January 2001.

According to The Hill: “I went to Trump Tower after the election,” said Gore, who was on the show to promote his new movie, “An Inconvenient Sequel: Truth to Power.”

“I thought that there was a chance he would come to his senses. But I was wrong.”

The former vice president perhaps can take some solace in the belief — at least I believe it — that Trump doesn’t understand climate change or that he doesn’t grasp the theories floated by scientists around the world that human activity is a major cause of the planet’s changing climate.

Science means nothing to the reality TV celebrity-turned-president of the United States.

It doesn’t make Al Gore feel any better, to be sure. Perhaps his wellspring of hope is diminished somewhat as it regards the president of the United States.