The second largest ice sheet on Earth is melting. Researchers attribute its melting to the global warming crisis. It appears to be motionless from the air, but beneath the surface the sheet is constantly moving, and fragmenting into glaciers, and in warm months those glaciers will melt into the ocean.

Scientists fear that this will raise the ocean level significantly, and this would put low lying cities t risk of floods. Cities in danger would be cities like New York City, and Shanghai, China.

The ocean is expected to rise 1.5 feet by 2100.