Twitter users turned the tabloid's tweet against itself.
Biden has pledged to rejoin the Paris climate accord and to invest $2 trillion to wean the country off planet-warming fossil fuels.
As COVID-19 spread, the WHO often shied away from criticizing countries including Japan, France, and Britain, which made repeated mistakes.
It has been a U.S. election like no other, and global interest in the 2020 race to the White House has been unprecedented.
"It's time to get back to building bridges, not walls," London Mayor Sadiq Khan tweeted.
The United States has formally withdrawn from the global pact -- but the outcome of the presidential election could determine the country's future in the agreement.
Mayor Christian Estrosi described the attack as terrorism. A suspect has been arrested, French police said.
France is recording more than 50,000 new coronavirus cases a day but a doctor who advises the government thinks the actual number is closer to 100,000.
"I said, 'Guys, just thank God that was me,'" the reality star told David Letterman.
The house of worship is being closed for six months after it shared a Facebook video that expressed anger towards Samuel Paty before his death.