(CNN) In 2050, London's climate will feel more like Barcelona's, according to a new climate change study.

If this sounds like a pleasant warming -- think again. London could be facing severe drought, as Barcelona did in 2008, when it nearly ran out of drinking water and reservoirs ran close to dry.

Hundreds of other major cities worldwide could be facing droughts, flooding, storms, and other climate catastrophes, said the study, which was conducted by the Crowther Lab at ETH Zurich university.

Some of these climate effects aren't even known or predictable yet -- a fifth of cities, including Kuala Lumpur, Jakarta, and Singapore, are facing conditions so extreme they don't currently exist anywhere in the world, according to the study.

The study predicted the future climate conditions of 520 major cities worldwide, and paired those predictions with the conditions of cities today. By 2050, Madrid will feel more like Marrakesh, Seattle will feel like San Francisco, and New York will feel like Virginia Beach, according to the report.

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