The mercury has since dipped again, but experts say the short surge marked a new global heat record for June and indicates more extremes ahead as the planet enters an El Nino phase that could last years.
Still, the 11 days spent at the 1.5-degree threshold shows how important it is for scientists to keep a close watch on the planet's health, not least because previous spikes above 1.5 have all happened during winter or spring in the northern hemisphere, she said. "It's really critical to monitor the situation, to understand what implications this has for the summer to come."
That's because a three-year La Nina phase -- which tends to dampen the effects of global warming -- has given way to the opposite, an El Nino period, which could add another half-degree or more to average temperatures. "We know as well the warmer the global climate is, the more likely we are to have extreme events and the more severe those extreme events may be," she said. "So there's a direct correlation between the degree of global warming and the frequency and intensity of extreme events."
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