Demonstrators carrying a Portugal flag march during a protest towards the official residence of the Prime Minister at Sao Bento Palace in Lisbon December 18, 2013. [Photo/Agencies]
Sea-level rise since the Industrial Revolution has been fast by natural standards and may reach 80 cm above today's sea-level by the year 2100 and 2.5 m by 2200 even without development of unexpected processes, according to a new research made public on Friday.