"Policymakers are interested in sea-level rise because of the risk to coastal populations and infrastructure and the consequences for coastal species and ecosystems. From 1901 to 2010, global sea levels rose an estimated 187 millimeters (mm; 7.4 inches), averaging a 1.7 mm (0.07 inch) rise annually. Estimates are that the annual rate rose to 3.2 mm (0.13 inches) from 1992 to 2010. Although the extent of future sea-level rise remains uncertain, sea-level rise is anticipated to have a range of effects on U.S. coasts. It is anticipated to contribute to flood and erosion hazards, permanent or temporary land inundation, saltwater intrusion into coastal freshwaters, and changes in coastal terrestrial and estuarine ecosystems..."