Expect more. That’s the verdict of climate scientists to the record-high temperatures this spring and summer in vastly different climate zones.

The contiguous United States had its hottest month of May and the third-hottest month of June. Japan was walloped by record triple-digit temperatures, killing at least 86 people in what its meteorological agency bluntly called a “disaster.” And weather stations logged record-high temperatures on the edge of the Sahara and above the Arctic Circle.

Is it because of climate change? Scientists with the World Weather Attribution project concluded in a study released Friday that the likelihood of the heat wave currently baking Northern Europe is “more than two times higher today than if human activities had not altered climate.”

While attribution studies are not yet available for other record-heat episodes this year, scientists say there’s little doubt that the ratcheting up of global greenhouse gases makes heat waves more frequent and more intense.