Which of the following trace gases does not contribute to climate change?
A) CFCs
B) Nitrous oxide
C) Krypton
D) Methane
Q. 2 - How will melting permafrost in polar regions lead to a positive feedback loop that will continue to warm the climate, which will allow for more permafrost to melt?
A) Buried CFCs will be released from contaminants in frozen vegetation
B) Methane will be released as the vegetation thaws
C) Nitrous oxide will be trapped in the meltwater generated and pulled out of the atmosphere
D) Carbon dioxide is sequestered in the water infiltrating the landscape
Q. 3 - If CFCs have not been widely used since the late 20th century, why are they considered a major greenhouse gas in the 21st century?
A) Although they have been banned, they are being use illegally
B) CFCs are released by a number of natural processes, such as volcanoes
C) Greenhouse gases such as methane will break down into CFCs
D) CFCs can stay in the atmosphere for decades
Q. 4 - How can agriculture be responsible for increasing the amount of methane in the atmosphere?
A) Crops like corn and soybeans add methane to the atmosphere
B) Methane is emitted by bacteria in the gut of agricultural animals, such as cattle and sheep
C) Overtilling the land will cause the soil to break down and release greenhouse gases
D) Fumes from liquid fertilizer are opening holes in the ozone
Q. 5 - Temperature increases in polar regions are going to be ________ the global average.
A) lower than
B) greater than
C) equal to
Q. 6 - How will explosive volcanic eruptions affect global temperatures?
A) Temperatures will raise
B) Temperatures will lower
C) Temperatures will remain the same
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