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The Eiffel Tower submerges into darkness as part of the Earth Hour switch-off in Paris, France, on Saturday. Photo: Pierre Suu/Getty Images

Cities around the world were turning landmark lights off Saturday for Earth Hour, with this year's theme highlighting the link between the destruction of nature and increasing outbreaks of diseases like COVID-19.

The big picture: City landmarks around the world went dark for an hour at 8:30p.m. to mark global action on climate change. Organizer WWF said in a statement, "COVID-19 has given us a stark warning of the risks, vulnerabilities and inequalities of our interconnected systems."

A tweet previously embedded here has been deleted or was tweeted from an account that has been suspended or deleted.
The Palace of Westminster, containing the House of Commons and House of Lords, takes part in Earth Hour in London, England. UN chief António Guterres in a statement called 2021 a "make-or-break year" for the climate, saying: "It’s time to re-evaluate and reset our relationship with nature." Photo: Yui Mok/PA Images via Getty Images
The India Gate in New Delhi, India. Photo: Prakash Singh/AFP via Getty Images
The Xi'an Bell Tower's lights are turned off in Xi'an, Shaanxi Province, China. Photo: Shang Hongtao/VCG via Getty Images
A view of the Colosseum in Rome, Italy, with the lights off. Photo: Baris Seckin/Anadolu Agency via Getty Images
The Sydney Harbour Bridge and the Opera House are plunged into darkness in Australia. Photo: Peter Parks/AFP via Getty Images
A view from Red Square during Earth Hour in Moscow, Russia. Photo: Sefa Karacan/Anadolu Agency via Getty Images
Combination images of a view of the Puente de la Mujer at Puerto Madero neighborhood before (top) and after being submerged into darkness in Buenos Aires, Argentina. Photo: Alejandro Pagini/AFP via Getty Images
Combination images of South Korea's Namdaemun Gate before (top) and after its lights went out in Seoul. Photo: Jung Yeon-je/AFP via Getty Images

Go deeper: Living with climate catastrophe

Go deeper

In photos: Deadly tornadoes leave path of destruction across the South

The aftermath of the tornadoes in Ohatchee, Alabama. Photo: Julie Bennett via Getty Images

A major outbreak of high-end, "violent" tornadoes and severe storms ripped through the South on Thursday, leaving behind debris and destruction.

The big picture: At least six people were killed. Severe weather in this region can be especially deadly due to the housing types that are prevalent here, including large numbers of mobile homes, Axios' Andrew Freedman writes.

Massachusetts Gov. Charlie Baker will not seek re-election in 2022

Mass. Gov. Charlie Baker (R) speaking during a press conference in November 2021. Photo: Jonathan Wiggs/The Boston Globe via Getty Images

Massachusetts Gov. Charlie Baker (R), a moderate who typically ranks as one of the nation's most popular governors, said Wednesday that he and Lt. Gov. Karyn Polito (R) will not seek third terms in 2022.

Why it matters: The decision leaves the gubernatorial race wide open and will likely affect multiple down-ballot races next year. Baker was expected to be the front-runner had he joined the race.

3 hours ago - Health

CDC prepares tougher testing rules for international travelers

Travelers with their luggage arrive at a COVID-19 testing location at the airport in Los Angeles, Calif., on Nov. 23, 2021. Photo: Frederic J. Brown/AFP via Getty Images

The Centers for Disease Control and Prevention said Tuesday night that it is working to impose stricter testing requirements for international travelers due to the spread of the new Omicron variant.

The big picture: The new rules would require all international travelers, regardless of vaccination status, to show a negative test taken a day before their flight to the U.S. Currently, the CDC says fully vaccinated travelers are allowed to show a test taken no more than three days before their departure, AP reports.