Experts anticipate that global atmospheric concentrations of carbon dioxide (CO2) will have doubled by the end of the twenty-first century. ██ ██ █████ ████ ███ ███ ██████████ ██ ██████ ███████ ██ ████████ █████ ██████ ████ ██ █████ ██████████ ██ ████ ████ ███ ███████ ████████ ███
Support for Critique 2 ·Global warming leads to more decomposing peat, which will release more CO2 into atmosphere
Although more CO2 can lead to more plant growth, which can absorb more CO2, that's counteracted by increased release of CO2 from peat.
Passage Style
Critique or debate
22.
According to the passage, Billings' ████████ █████████ █████ ███ ██ ███ █████████ ██████████
Question Type
Stated
This is a Stated question concerning Billings’ research. We know from P3 that Billings’ simulation found that global warming in wet tundra grasslands caused increased plant growth, increased peat decomposition, and increased CO2 levels.
a
Which kind of ███████ ████ ██████████ ███ ████████ ███████████ ████████ ██ ██ ██████████ ████ ██ ████
The author says that Billings’ research on the tundra is important because high-latitude habitats like the tundra are expected to experience the greatest temperature increase. But Billings’ research never addresses which habitat will experience the greatest temperature increase.
b
How much will ██████ ████████████ ████ ██ ██████ ██ ███ ██████ ██ ███ ███ ██ ███ ████████████ ████████
This is not stated in the passage. Billings’ never tells us how much summer temperatures will rise. He just says that if they rise by four degrees Celsius, then the tundra will release 50% more CO2.
In Billings’ global warming simulation described in P3, plant growth did increase. But, because of increased peat decomposition, CO2 levels also increased. This suggests that enhanced plant growth will not necessarily decrease the predicted rate of global warming.
This is not answered by Billings’ research. In P1, we see that experts believe CO2 levels will double by the end of the century. In P2, we see that some studies show that increased CO2 will differentially increase plant growth rate. But Billings’ research doesn’t address these points.
This is not stated in the passage. Billings never compares the rate of peat decomposition in wet tundra grasslands to peat decomposition anywhere else.
Difficulty
72% of people who answer get this correct
This is a difficult question.
It is similar in difficulty to other questions in this passage.
CURVE
Score of students with a 50% chance of getting this right
25%143
155
75%168
Analysis
Stated
Critique or debate
Science
Answer Popularity
PopularityAvg. score
a
13%
165
b
3%
160
c
72%
168
d
4%
159
e
9%
161
Question history
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