If the earth’s average surface temperature continues to change over the next 30 years at the same rate it changed between 1980 and 2010, the average temperature will most likely be around
a. 0.2°c lower than in 1990.
b. 0.6°c higher than in 2010.
c. the same as it was in 1980.
d. the same as it was in 2000.