Experts anticipate that global atmospheric concentrations of carbon dioxide (CO2) will have doubled by the end of the twenty-first century. ββ ββ βββββ ββββ βββ βββ ββββββββββ ββ ββββββ βββββββ ββ ββββββββ βββββ ββββββ ββββ ββ βββββ ββββββββββ ββ ββββ ββββ βββ βββββββ ββββββββ βββ
Support for Critique 2 Β·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
20.
The passage supports which one ββ βββ βββββββββ ββββββββββ βββββ ββββ ββ βββ ββββββ βββββββββββ
Question Type
Implied
Billingsβ simulation tells us that global warming will cause CO2 levels to rise in wet tundra grasslands. This causes increased plant growth, which causes increased decomposing peat, which releases more CO2 into the atmosphere.
a
More of it βββββ βββββββββ ββ ββββββββββββ ββββ ββββ βββββββ ββββββββ
Supported. We know that global warming causes increased plant growth, increased peat decomposition, and increased CO2 levels in wet tundra grasslands. This shows that if temperatures rose four degrees, the tundra would release 50% more CO2, suggesting that much more peat would be decomposing.
b
It could help ββββββ βββ ββββ βββ ββββββββββ ββ ββββββββββββ ββββ ββββ βββββββ ββββββββ
Anti-supported. This shows that if temperatures rose four degrees, peat in the tundra would release 50% more CO2, not absorb it.
c
It will not βββββββββ ββββββ ββββββββββββ ββββ ββββ βββββββ ββββββββ
Unsupported. This suggests that peat decomposition will greatly increase if temperatures rise four degrees. But we canβt infer that peat will not decompose at all if temperatures stay the same or rise less than four degrees.
d
It decomposes more βββββββ ββββ ββββ βββββ ββ βββββββ ββ βββββ ββββββββββ
Unsupported. Higher regions like the tundra are expected to have the greatest temperature increase, which will increase peat decomposition, but this doesnβt mean that peat decomposes more quickly there. Other factors could cause peat in lower regions to decompose just as fast or even faster, despite a smaller temperature increase.
e
More of it βββββββββββ ββ βββββββ ββ βββββ ββββββββββ
Unsupported. We have no idea where the most peat accumulates. We just know that higher regions like the tundra are expected to have the greatest temperature increases, which will cause increased plant growth, increased peat decomposition, and increased CO2 levels.
Difficulty
87% of people who answer get this correct
This is a moderately difficult question.
It is somewhat easier than other questions in this passage.
CURVE
Score of students with a 50% chance of getting this right
25%137
147
75%157
Analysis
Implied
Critique or debate
Science
Answer Popularity
PopularityAvg. score
a
87%
167
b
1%
157
c
1%
154
d
10%
162
e
1%
159
Question history
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