[Thousands of young people took to the streets on Friday for a day of global climate protest.]

These are some of the things that Greta Thunberg has learned on her American tour.

New York City smells. People talk really loudly here, they blast air conditioning and they argue over whether or not they believe in climate change, while in her country, Sweden, they accept it as fact.

Also, American lawmakers would do well to read the latest science on the threats posed by climate change.

That’s what Ms. Thunberg, 16, told members of Congress on Wednesday, when she was asked to submit her testimony into the record. She submitted a report issued last October by the Intergovernmental Panel on Climate Change, spelling out the threats of global temperature rise. “I don’t want you to listen to me,” she said. “I want you to listen to the scientists.”