1 foot, (0.3 metres)

“A predicted rise in sea level of one foot within the next 30 to 40 years will drive much of the Atlantic and Gulf shoreline inward by 100 feet and some of it by more than 1,000 feet, according to marine geologists.”
Erik Eckholm, “The Rising Seas Problems will Seep Far Inland,” Chicago Tribune, March 16, 1986