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The study concludes that anthropogenic climate change significantly increased the likelihood of the June 2017 heat event across Western Europe. Using observational data and multiple climate model ensembles, researchers found that such extreme heat is now more frequent, occurring every 10 to 30 years depending on the country. The risk ratio was highest in Portugal and Spain, where the probability of such heat increased by more than ten times due to global warming. The report also notes that under high-emission scenarios (RCP8.5), temperatures similar to June 2017 could become normal by the end of the century.

The study uses the Water Evaluation and Planning (WEAP) system to model how climate change and rising temperatures increase agricultural water demand, thereby reducing water supply reliability. It concludes that addressing these impacts requires fundamental changes to the operation of the water management system.