Katowice — Halfway through talks to breathe life into the Paris climate deal negotiators haggled over how to share the cost of curbing global warming and struggled to bridge deep political divides. The two weeks of talks, which began at the start of the week, are billed as the most important UN conference since the Paris 2015 agreement on climate change. The challenge is to meet a year-end deadline to agree a rule book to limit global warming, when the unity that underpinned the Paris talks has fragmented. US President Donald Trump repeated his call to scrap the Paris climate pact. By the end of Saturday, negotiators aim to have a simplified a draft for high-level ministerial debate starting on Monday. “We still have a lot to do,” Michal Kurtyka, the Polish president of the UN talks, told a news conference. “It is very technical, very complex, very difficult.” Delegates said a major issue was how to reassure developing countries that richer nations would deliver on promises to help ...

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