Burning fossil fuels and destroying forests have released enough greenhouse gases into the atmosphere to also boost the frequency and intensity of many floods, droughts, wildfires and tropical storms, they detailed in a state-of-science report.
"Every heatwave in the world is now made stronger and more likely to happen because of human-caused climate change," Otto and co-author Ben Clarke of the University of Oxford said in the report, presented as a briefing paper for the news media. The most scientists could say before is that an unusually severe hurricane, flood or heatwave was consistent with general predictions of how global warming would eventually influence weather.
With more data and better tools, however, Otto and other pioneers of a field known as event attribution science have been able to calculate - sometimes in near real time - how much more likely or intense a particular storm or hot spell has become due to global warming.Otto and colleagues in the World Weather Attribution consortium, for example, concluded that the heatwave that gripped western North America last June - sending temperatures in Canada to a record 49.
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