As scientific projections of the effects of climate change become more robust, the threats posed by extreme storms, catastrophic flooding, heat waves, and droughts have gotten clearer and more frightening.

The Intergovernmental Panel on Climate Change has predicted that global temperatures could rise 1.5 degrees Celsius above preindustrial levels by 2040. By the turn of the century, temperatures could climb even higher, spelling disaster in some areas.

Read more: We asked 11 climate scientists where they'd live in the US to avoid future natural disasters — here's what they said

In the future, cities that are prone to flooding or heat waves could see more severe — and potentially fatal — weather conditions. With this in mind, scientists have begun to pinpoint locations that could become unbearable for humans by 2100.

These 11 cities might one day soon struggle to support human life. Many are already witnessing the devastating effects of climate change.