As ice shelves disintegrate in Antarctica and Greenland, the land ice behind them can flow into the ocean at accelerating rates, causing sea levels to rise. Carbon pollution caused by human activities is a primary driver of climate change and ice sheet loss. Suppose we emit enough carbon to cause 4 degrees Celsius of warming (7.2 degrees Fahrenheit). In that case, we could lock in enough eventual sea-level rise to submerge land currently home to millions of people around the world. Join this class on Google Earth as he travels globally to these potentially fateful cities that could be dramatically affected by rising oceans.