In his strongest comments yet on global heating, the prime minister laid bare the devastating consequences of the world failing to agree action at the looming Cop26 summit.
“It will be the people in the audience, it will be your generation, young people, who are left to deal with the consequences if we should fail,” he told the event in Milan.
“Because a child born in 2020 will endure seven times as many extreme heatwaves and twice as many droughts as their grandparents.
“Hundreds of millions of you are facing rising seas, failing crops, burning forests and ever-more ferocious storms. Daily challenges that lead to lost opportunity.