2. Sea Level Change, past, present, and future (a) This is a graph of the average sea surface temperature from 1880 to 2021. From the year 1910 to 2021, the average temperature rose by about 2 C. What amount of sea level rise should we expect, in meters, based solely on the thermal expansion of seawater? (Assume the ocean has an average linear expansion coefficient of about 200 x 10-6 C-1 and has an average depth of 3650 m) (b) What is one other factor, besides thermal expansion of water, that could be contributing to sea level rise? What can we do about it? Average Global Sea Surface Temperature, 1880-2020 2.0 1.5 1.0 0.5 1971-2000 average Temperature anomaly (F) 0 -0.5 -1.0 1.5 2.0 1880 1900 1920 1940 1960 1980 2000 2020 Year