In a companion essay, Peter Stott at the Met Office Hadley Centre in Exeter, UK, suggests that this statistic should be a "sobering thought" for policy-makers looking to protect their cities and countries.
The numbers align with what climate scientists already suspected, says Francis Zwiers, a statistician at the University of Victoria in British Columbia, Canada. But they can help us when we wonder whether an unusually hot day is the result of global warming, or just chance.
"You can turn that question into an answer," he says. "We shouldn't be quite so surprised when what was formerly a once-in-a-20-year event occurs. We should be expecting it."
In a companion essay, Peter Stott at the Met Office Hadley Centre in Exeter, UK, suggests that this statistic should be a "sobering thought" for policy-makers looking to protect their cities and countries.The numbers align with what climate scientists already suspected, says Francis Zwiers, a statistician at the University of Victoria in British Columbia, Canada. But they can help us when we wonder whether an unusually hot day is the result of global warming, or just chance."You can turn that question into an answer," he says. "We shouldn't be quite so surprised when what was formerly a once-in-a-20-year event occurs. We should be expecting it."
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