The 1901 - 2000 average combined
land and ocean annual temperature is 13.9 °C (56.9 °F), the
annually averaged
land temperature for the same period is 8.5 °C (47.3 °F),
and the long - term
annually averaged sea surface temperature is 16.1 °C (60.9 °F).
Note that the gross amounts of carbon
annually exchanged between the
ocean and atmosphere,
and between the
land and atmosphere, represent a sizeable fraction of the atmospheric CO2 content
and are many times larger than the total anthropogenic CO2 input.