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A body sanctioned by the UN, the Intergovernmental Panel on Climate Change, issued its latest and most dire assessment about the state of the planet and the impact of human behaviour on the climate.
It found global warming is unfolding more quickly than feared and humanity is almost entirely to blame. It's being described as a "code red for the planet" and a "wake up call" for world leaders.
Climate scientist and co-author of the report James Renwick spoke to Corin Dann.