But there is bound to be continued disagreement. Previous studies had been unable to link the two, and one by the National Oceanic and Atmospheric Administration concluded that the Russian drought, which also led to devastating wildfires, was not related to global warming.
White House science adviser John Holdren praised the paper's findings in a statement. But he also said it is true that scientists can't blame single events on global warming: "This work, which finds that extremely hot summers are over 10 times more common than they used to be, reinforces many other lines of evidence showing that climate change is occurring and that it is harmful."
Skeptical scientist John Christy of the University of Alabama at Huntsville said Hansen shouldn't have compared recent years to the 1950s-1980s time period because he said that was a quiet time for extremes.
But Derek Arndt, director of climate monitoring for the federal government's National Climatic Data Center, said that range is a fair one and often used because it is the "golden era" for good statistics.
Granger Morgan, head of engineering and public policy at Carnegie Mellon University, called Hansen's study "an important next step in what I expect will be a growing set of statistically-based arguments."
In a landmark 1988 study, Hansen predicted that if greenhouse gas emissions continue, which they have, Washington, D.C., would have about nine days each year of 95 degrees or warmer in the decade of the 2010s. So far this year, with about four more weeks of summer, the city has had 23 days with 95 degrees or hotter temperatures.
Hansen says now he underestimated how bad things would get.
And while he hopes this will spur action including a tax on the burning of fossil fuels, which emit carbon dioxide, a key greenhouse gas, others doubt it.
Science policy expert Roger Pielke Jr. of the University of Colorado said Hansen clearly doesn't understand social science, thinking a study like his could spur action. Just because people understand a fact that doesn't mean people will act on it, he said.
In an email, he wrote: "Hansen is pursuing a deeply flawed model of policy change, one that will prove ineffectual and with its most lasting consequence a further politicization of climate science (if that is possible!)."
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