NASA has just released what it calls the most comprehensive survey ever attempted of the Antarctic and Greenland ice sheets, confirming scientists's grave concerns that “climate warming is changing how much water remains locked in Earth’s largest storehouses of ice and snow,” according to the agency’s recent press release. “If the trends we’re seeing continue and climate warming continues as predicted, the polar ice sheets could change dramatically,” says the release, which means that sea levels, in turn, will likely also change dramatically (upward).