(CNN) There are plenty of ominous indicators of the consequences of climate change, but few are more worrying to scientists than the ice sheets of Antarctica at our planet's southern pole.

These ice sheets have been melting for quite some time, and it doesn't take a degree in physics to understand the risk there. As the ice melts it flows into the ocean, causing sea levels to rise. And rising sea levels are obviously a huge problem.

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Now, new NASA-funded research published in the journal PNAS reveals a concerning complication. Scientists from the Georgia Institute of Technology, NASA Jet Propulsion Laboratory and the University of Washington ran hundreds of simulations to predict how one large ice sheet, Thwaites Glacier, could degrade over the next 50 to 800 years.

The results showed the glacier was more in danger of becoming unstable that previously thought.

The Thwaites Glacier.

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