Dr. Mona Hanna-Attisha, who was among the first to raise a red flag over the contamination of water in Flint, Mich., says the filing of charges "helps the city and the people move on and recover."

The entertainers will be joined by a Georgia firefighter and a Jesuit priest at the Capitol ceremony.

As Americans stayed home during the pandemic, cars and planes produced less heat-trapping emissions. But the effect is only temporary.

Their arrival comes more than a week after an unexpected delay prevented the scientists from entering China.