UK prime minister Boris Johnson has warned it was time for humanity to ‘grow up’ and finally take responsibility for the destruction caused by the climate crisis. Johnson used his speech to urge fellow global leaders to act ahead of the next climate summit. ‘The Glasgow COP26 summit is the turning point for humanity,’ Johnson said. He went on to claim the Muppets character Kermit the Frog was wrong when he sang: ‘It’s not easy being green’.