By Andrea Germanos
Greta Thunberg, the 15-year-old Swedish activist, on Wednesday called for a global climate strike. The day of action is set for Friday at "your school" or "anywhere you feel called."
Thunberg, who's made headlines for her now-weekly school strikes to urge her home country to take bold climate action, made the call from Katowice, Poland, where she's attending the COP24 climate talks, now in their second week.
By Chloe Farand
The Polish government has implemented a terrorism alert in the province where the annual UN climate talks are about to start.
Climate campaigners are warning of a tense atmosphere in and around the city of Katowice in southern Poland, where the global climate negotiations, known as COP24, are due to kick off on Monday.