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"Many of these events ... bear the telltale sign of climate change caused by increased greenhouse gas concentrations from human activity," Taalas said in a statement. Negotiators at the 12-day, 196-nation talks are tasked with fleshing out the 2015 Paris climate treaty, which calls for capping global warming at "well under" two degrees Celsius (3.6 degrees Fahrenheit), or even 1.5 C if possible. Another report last week from UN Environment said the trajectory of current national efforts to reduce carbon pollution fall far short, and would see the world heat up a scorching 3 C by the end of the century. Earth's surface has already warmed by 1 C compared to pre-industrial levels. "The impacts of extreme weather this year give us a taste of things to come under a warming climate," said Richard Betts, a professor of climate impacts at the Met Office Hadley Centre in England, commenting on the report. Nowhere will be spared, but "developing countries will be hit the hardest in terms of human impact," he added. Long-term climate trends tracked by the WMO all showed movement in the wrong direction, the UN agency said. Concentrations in the atmosphere of the major greenhouse gases that drive global warming continued to increase, with carbon dioxide (CO2) at 403.3 parts per million (ppm), the highest level in at least 800,000 years. The second-most polluting greenhouse gas -- methane (CH4) -- has also shot up over the last decade, driven by leakage from the gas industry's fracking boom, and growth in global livestock.
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