Disturbing before-and-after images show what major US cities could look like in the year 2100

The world’s ocean levels are rising at faster and faster rates as waters warm and ice sheets melt.

Researchers led by Steve Nerem, a professor of aerospace engineering at the University of Colorado-Boulder, looked at satellite data dating back to 1993 to track the rise of sea levels.

Their findings, published in the journal Proceedings of the National Academy of Sciences, show that sea levels aren’t just rising — but the increase has been accelerating

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