Global temperatures reached a key threshold this June. Scientists say it's a sign of things to come

Global temperatures briefly crossed a key warming threshold earlier this month, a sign of heat and its damage, scientists fear. The mercury has since fallen again, but experts say the brief rise marked a new global temperature record for June and hints at more extremes to come as the planet enters an El Niño phase that can last for years. Researchers from the European Union's Copernicus Climate Change Service said on Thursday that global surface air temperatures rose by 1.5 degrees Celsius compared to pre-industrial levels for the first time in early June. That's the limit governments said they would try to stay within at the 2015 summit in Paris. (Associated Press)

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