G20 world leaders arrive in Rome for summit

Leaders from the world’s 20 richest economies are due to commit this weekend (October 30-31) to tackling the existential threat of climate change, ahead of the UN climate change summit next week in Glasgow.

World leaders, including US President Joe Biden and UK Prime Minister Boris Johnson, will pledge to take urgent steps to limit global warming to 1.5 degrees Celsius (2.7 degrees Fahrenheit).

UN climate experts say a 2050 deadline is crucial to meet the 1.5 degree limit, but some of the world's biggest polluters say they cannot reach it, with China, by far the largest carbon emitter, aiming for 2060.

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