World leaders arrive for COP26 climate summit

The COP26 conference in the Scottish city of Glasgow opens a day after the G20 economies failed to commit to a 2050 target to halt net carbon emissions - a deadline widely cited as necessary to prevent the most extreme global warming.

Instead, their talks in Rome only recognized "the key relevance" of halting net emissions "by or around mid-century," set no timetable for phasing out coal at home and watered down promises to cut emissions of methane, a greenhouse gas many times more powerful than carbon dioxide.

Many of those leaders take to the stage in Glasgow on Monday to defend their records and in some cases make new pledges at the start of two weeks of negotiations that conference host Britain is billing as make-or-break.

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