“It was sad and it was frustrating,” said Klaus, one of the world’s most vocal skeptics on the topic of global warming.

“It’s a propagandistic exercise where 13-year-old girls from some far-away country perform a pre-rehearsed poem,” he said. “It’s simply not dignified.”

At the opening of the summit attended by nearly 100 world leaders, 13-year-old Yugratna Srivastava of India told the audience that governments were not doing enough to combat the threat of climate change.