Which one of the following is an ecosystem service?

A) creation of pollution
B) genetically modifying food
C) global warming
D) pollination of crop plants
E) erosion

D

Environmental & Atmospheric Sciences

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A desert oasis occurs where the water table is at the surface. Indicate whether the statement is true or false

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Melting permafrost is expected to release carbon dioxide into the air, promoting further warming. This is

A) a negative feedback. B) a positive feedback. C) a direct thermal circulation. D) a parameterization.

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Environmental & Atmospheric Sciences

What substance accounts for more than half of the human-generated greenhouse gases?

A) chlorofluorocarbons B) carbon dioxide C) methane D) nitrous oxide E) ozone

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Environmental & Atmospheric Sciences

What percentage of global greenhouse gas emissions come from the U.S.?

A. 25 percent B. 10 percent C. 35 percent D. 50 percent

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Environmental & Atmospheric Sciences