New York Times: Sea levels are rising, and rising faster every year. According to the latest report of the Intergovernmental Panel on Climate Change, sea levels rose an average of 1.7 millimeters a year during the 20th century. Some areas have had larger rises than others, and measurements vary from year to year at different locations. Measuring sea level is difficult. Scientists use tidal gauges and satellite altimeter data to measure these changes, and there are some questions about the precision of these tools....