Roughly 70% of the 5 × 10¹⁴ m² of Earth’s surface is covered by oceans. How much energy would it take to melt enough of the ice in Greenland and Antarctica to raise sea levels 1 meter? Suppose that 1% of energy used by humans became waste heat that melts ice. How long would it take to melt this quantity of ice? If an increase in atmospheric CO₂ led to a net energy flux of 2000 TW of solar energy absorbed into the Earth system of which 1% melts ice, how long would it take for sea levels to rise one meter?