After reading the passage and reviewing the data it appears that, although the results of changing the natural atmospheric greenhouse are difficult to predict, certain effects seem likely. What are they? The oceans will warm and partially melt glaciers and other ice, increasing sea level.

Warmer conditions will probably lead to more evaporation and precipitation overall.

Higher temperatures and shifting climate patterns may alter the makeup of natural communities.

A reasonable extrapolation of the temperature anomaly using the graph of Global Surface Temperature, if the current trend continues to the year 2020 would be 2.5oC.

As snow and ice cover on Earth increases, solar reflection will also decrease.