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Climate change is a “grave” security threat, Boris Johnson has warned ahead of chairing a United Nations Security Council session on Tuesday.
It will be the first time a British PM has chaired such a meeting since 1992.
Other speakers include broadcaster Sir David Attenborough, UN Secretary General António Guterres and Sudanese climate activist Nisreen Elsaim.
The UK holds the presidency of the Security Council this month and hosts the COP26 climate summit in November.
The summit in Glasgow will be attended by dozens of world leaders and is likely to be the most significant round