This week’s Climate Week in New York involves numerous businesses, governments and environmental groups, and runs alongside the UN general assembly which will, on Wednesday, include a gathering of more than 100 national governments aimed at heightening global ambition to cut emissions. The UN has warned the world is well off track to meet goals that would avert disastrous climate change.

London mayor Sadiq Khan warned that the city is facing 45C days ‘in foreseeable future’.