Ahead of a critical climate conference in Glasgow, which kicks off on Oct. 31, Johnson told the U.N. General Assembly: "We need all countries, every single one of you, to step up and commit to very substantial reductions by 2030, and I am absolutely convinced, I passionately believe that we can do it by making commitments in four areas and I want you to remember them - coal, cars, cash and trees."
The U.N. COP26 conference aims to spark much more ambitious global climate action - and the money to pay for it - as scientists warn that global warming is dangerously close to spiraling out of control.
"We must show that we are capable of learning and maturing and finally taking responsibility for the destruction we are inflicting, not just upon our planet, but upon ourselves. It's time for humanity to grow up," Johnson said.
A U.N. analysis of country under the 2015 Paris agreement on climate on Friday (September 17) showed global emissions would be 16% higher in 2030 than they were in 2010 - far off the 45% reduction by 2030 that scientists say is needed to stave off disastrous climate change.