The Joint Research Centre highlighted that the drought in much of Europe is "critical" as the "winter-spring precipitation deficit ... was exacerbated by early heatwaves in May and June."

Water supply may be "compromised" in the coming months, according to the report.

Speaking to CNN on Monday, Oxford University Professor Myles Allen warned that such heatwaves will be inevitable if mankind doesn't soon reduce its carbon emissions.

"This isn't a new normal because we're just on a trend towards ever hotter temperatures," Allen told CNN on Monday.

The solution, he said, is sweeping change across the energy industry. Individual companies are unlikely to change their business models unilaterally due to concerns over losing competitiveness with rivals, he added.

"It's got to be a regulation on the industry as a whole," said Allen.