who started school after the first covid lockdown. researchers in the uk say blood that has been grown in a laboratory has been put into people, in a world first clinical trial. it could help scientists manufacture rare blood groups. the head of the united nations has warned the cop27 climate conference in egypt that nations must co operate in the effort to reduce global emissions or perish. antonio guterres decribed the progress made since last year s gathering in glasgow as woeful. the prime minister, rishi sunak, is expected to warn world leaders later that it s essential that countries stick to the commitments made then to limit global warming to 1.5 degrees celsius above pre industrial levels. our climate editorjustin rowlatt reports from the conference. the world leaders swept into the conference centre in the egyptian desert this morning. among them the british prime minister, rishi sunak. there was a formal handshake with the un chief, all 120 world leaders at the