The floods battered New England, then Nashville, then Arkansas, then Oklahoma — and were followed by a deluge in Pakistan that has upended the lives of 20 million people.
The summer's heat waves baked the eastern United States, parts of Africa and eastern Asia, and above all Russia, which lost millions of acres of wheat and thousands of lives in a drought worse than any other in the historical record.
Seemingly disconnected, these far-flung disasters are reviving the question of whether global warming is causing more weather extremes.
The collective answer of the scientific community can be boiled down to a single word: probably.
"The climate is changing," said Jay Lawrimore, chief of climate analysis at the National Climatic Data Center in Asheville, N.C. "Extreme events are occurring with greater frequency, and in many cases with greater intensity."
He described excessive heat, in particular, as "consistent with our understanding of how the climate responds to increasing greenhouse gases."