Question: is sea level rise constant?
Answer: How much is sea level rising? Since 1900, sea level has risen between 1 and 2 millimeters per year (10-20 cm or 3.9-7.9 inches per century) on average. During the preceding 3,000 years, scientists estimate that sea level was almost constant, rising at a rate of 0.1 to 0.2 mm per year.