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The United Nations Secretary-General Antonio Guterres has said the world is waking up to the threat of climate change. Closing a special UN climate summit, he thanked young people for leading the charge. The United Nations has warned that Nigeria is facing a housing crisis, with conditions among the worst in the world. On a visit to the country, the UN's housing rapporteur (Leilani Farha) said more than two thirds of Nigerians lacked basic amenities. We hear from Jessie and Issac, two Malawian school children who are in London to give their British counterparts a powerful message about climate change.