Chernobyl wildfire blankets Kyiv in thick smog
Ukraine's capital is now among the world's most polluted cities, an international ranking shows.
Author Archives: BBC News - Science & Environment
Coronavirus: Sir John Houghton dies of suspected Covid-19
Sir John Houghton, who accepted the Nobel Peace Prize in 2007, died on Wednesday aged 88.
Coronavirus: Is there any evidence for lab release theory?
BBC News examines allegations that the coronavirus was accidentally released from a lab.