Which of the following human activities has resulted in the conversion of nearly 50 of the Earth's land surface?
A) Construction of roads and bridges
B) Construction of all homes and buildings
C) Agricultural production of crop and animal products
D) Construction and operation of mines
Question 2
Non-condensing GHGs are of greatest concern because they
A) take many decades to be removed from the atmosphere.
B) deplete stratospheric ozone.
C) react very quickly with other atmospheric gases.
D) react with one another to produce even more potent GHGs.
