Global sea-levels rose by an average of 3 mm a year over the past two decades . Most accurate data yet based on satellite data from European Space Agency . The study found that sea level rise in Greenland and Antarctica is accelerating. Venice one of many cities upgrading flood protection barriers .
Global sea-levels rose by an average of 3 mm a year over the past two decades . Most accurate data yet based on satellite data from European Space Agency . Sea-level rises uneven around the world with Pacific region hit worst . Venice one of many cities upgrading flood protection barriers .