An Arctic air mass has brought record-breaking low temperatures to several places in the US.
Severe flooding in Venice that has left much of the Italian city under water is a direct result of climate change, the mayor says.
Hong Kong’s rule of law has been pushed to the “brink of total collapse” after more than five months of protests, police have warned.
Nikki Haley, former US ambassador to the UN, has said two top White House aides encouraged her to undermine President Donald Trump.
Bolivian President Evo Morales has resigned after nearly 14 years in power, amid turmoil following his disputed re-election last month.
Former New York Mayor Michael Bloomberg, after saying in March that he wouldn’t run for president, is backtracking and preparing a potential run for a 2020 bid, a spokesman for the billionaire tells CNN.
A New York judge has ordered President Donald Trump to pay $2m (£1.6m) for misusing funds from his charity to finance his 2016 political campaign.
For the first time in 19 years, a team of scientists has detected a new strain of HIV.
US Democrats have made gains in state elections, in what is being seen as a blow to President Donald Trump.
The US has begun the process of withdrawing from the Paris Agreement, notifying the UN of its intention to leave, as other countries expressed regret and disappointment at the move.