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Attenborough, 94, the world's most influential wildlife broadcaster, addressed a virtual meeting of the 15-member council on climate-related risks to international peace and security, chaired by British Prime Minister Boris Johnson.
"If we continue on our current path, we will face the collapse of everything that gives us our security: food production, access to fresh water, habitable ambient temperature and ocean food chains," Attenborough said.
"And if the natural world can no longer support the most basic of our needs, then much of the rest of civilization will quickly break down," he added.
With the world struggling to cut planet-warming emissions fast enough to avoid catastrophic warming, the United Nations will stage a climate summit in November in Glasgow, Scotland.
It will be the most important gathering since the 2015 event that yielded the Paris Agreement, when nearly 200 countries committed to halt rising temperatures quickly enough to avoid catastrophic change.