By Gwladys Fouche OSLO (Reuters) – The world’s richest nations must implement their promises to keep alive a global goal to avoid the worst impacts of climate change, U.S. climate envoy John Kerry told Reuters on Saturday. Kerry said progress was vital as Egypt prepares to host the next round of U.N. climate talks, known as COP27, in November in Sharm el-Sheikh. For the meeting to be a success, the 20 richest nations accounting for 65% of global gross domestic product (GDP) must stay committed to limiting global warming to 1.5 degrees Celsius, as they did at last year’s U.N. summit in Glasgow,…

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