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Emissions rise from smokestacks at the PKN Orlen SA oil refinery in Plock, Poland, on Friday, July 17, 2020. Polish refiner PKN Orlen won conditional European Union approval to buy rival Grupa Lotos SA after agreeing on a extensive commitments package designed to allay potential competition concerns. Photographer: Bartek Sadowski/Bloomberg via Getty Images

History made: Renewable energy surpassed fossil fuels for European electricity in 2020

Snow is forecast for the drought-stricken West while showers head to the South

TOPSHOT - US President Joe Biden sits in the Oval Office as he signs a series of orders at the White House in Washington, DC, after being sworn in at the US Capitol on January 20, 2021. - US President Joe Biden signed a raft of executive orders to launch his administration, including a decision to rejoin the Paris climate accord. The orders were aimed at reversing decisions by his predecessor, reversing the process of leaving the World Health Organization, ending the ban on entries from mostly Muslim-majority countries, bolstering environmental protections and strengthening the fight against Covid-19. (Photo by Jim WATSON / AFP) (Photo by JIM WATSON/AFP via Getty Images)

Biden's decrees vault America back onto the global stage. A whiplashed world wonders for how long

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Two former Trump officials to be investigated for posting papers denying climate change

Steve Gray stands outside his home in Gillette, Wyoming. After the election, he called CNN concerned that his city could become a "ghost town." He says he was laid off from an oil field job in 2015, then subsequently from another job in oil and then one in coal last year.

This town powered America for decades. What do we owe them?

Steve Gray stands outside his home in Gillette, Wyoming. He called CNN concerned that, following the election of President Biden, that Gillette could become a "ghost town." He says he was laid off from an oil field job in 2015, then subsequently from another job in oil and then one in coal last year.

He called CNN after the election to share his biggest fear

Chicago, UNITED STATES: A passenger waits in line with her passport 23 January, 2007 before her Mexicana Air flight out of Chicago O'Hare International airport in Chicago, Illinois. As of 23 January, all Americans, Mexicans, Canadians and Bermudians traveling by air to the United States must for the first time carry a passport, said the Department of Homeland Security. The new measure is part of the department's Western Hemisphere Travel Initiative, following the recommendations of the National Commission on Terrorist Attacks on the United States, better known as the 9/11 Commission. It is aimed at making it more difficult for terrorists to enter the country with fake documents. AFP PHOTO/JEFF HAYNES (Photo credit should read JEFF HAYNES/AFP via Getty Images)

Find out which countries are welcoming US tourists back

A train moves through the Finger Lakes region of upstate New York.

The place that helped inspire American democracy