A climate summit of world leaders in 40 days' time will be the "turning point for humanity", UK Prime Minister Boris Johnson has said in a speech to the United Nations.
Four areas needed tackling - "coal, cars, cash and trees", he said.
Countries must take responsibility for "the destruction we are inflicting, not just upon our planet but ourselves".
"It's time for humanity to grow up," he added ahead of the UK hosting the COP26 summit in Glasgow, reports BBC.
The prime minister also said it was time to listen to the warnings of scientists. "Look at Covid if you want an example of gloomy scientists being proved right."
But he called on the country - which produces 28% of global greenhouse gas emissions - to go further and end its domestic use of coal, saying the UK was proof that it could be done.