Sky: The world is heading for a three-feet rise in sea level and NASA has warned it is too late to prevent it. Sea levels have risen about three inches since 1992 due to warmer temperatures and the burning of fossil fuels, but a further three feet would put millions of lives at risk. According to NASA, more than one-third of the human population - nearly 2.4bn people - lives within 100 km (60 miles) of an oceanic coast and low-lying capitals such as Dhaka in Bangladesh, with a population of 14 million...