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17 Dec 2023, 02:19
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The global warming potential (GWP) of a greenhouse gas is measured in teragrams (or million metric tons) of carbon dioxide (CO2) equivalent (Tg CO, Eq.). In 2010, total U.S. greenhouse gas emissions were 6821.8 Tg CO, Eq. The primary greenhouse gas emitted by human activities in the United States was CO2, representing approximately 83.6% of total greenhouse gas emissions. Overall, from 1990 to 2010, total emissions of CO2, increased by 605.9 Tg CO2, Eq. (11.90%). The largest source of CO2, and of overall greenhouse gas emissions, was fossil fuel combustion.
Within the United States, fossil fuel combustion accounted for 94.4% of CO2, emissions in 2010. Globally, approximately 30,313 Tg of CO2 were added to the atmosphere through the combustion of fossil fuels in 2010, of which the United States accounted for about 18%.
CO2, emissions result both directly from the combustion of fossil fuels for use in one of four end-use sectors (Transportation, Industrial, Residential, and Commercial)—and indirectly from the generation of electricity that is consumed by these sectors.
Within the United States, fossil fuel combustion accounted for 94.4% of CO2, emissions in 2010. Globally, approximately 30,313 Tg of CO2 were added to the atmosphere through the combustion of fossil fuels in 2010, of which the United States accounted for about 18%.
CO2, emissions result both directly from the combustion of fossil fuels for use in one of four end-use sectors (Transportation, Industrial, Residential, and Commercial)—and indirectly from the generation of electricity that is consumed by these sectors.
In 2010, total U.S. CO2 emissions were approximately 5707.4 Tg.: Yes
In 2010, U.S. greenhouse gas emissions, not counting CO2 emissions from fossil fuel combustion for electricity generation, were 4563.3 Tg CO2 Eq.: Yes
In 2010, methane emissions in the U.S. were less than 6% of total U.S. greenhouse gas emissions.: No
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
95%
(hard)
Question Stats:
30% (03:41) correct
70%
(03:56)
wrong
based on 400
sessions
History
Date
Time
Result
Not Attempted Yet
1. For each of the following statements, select Yes if it can be reasonably inferred from the given information. Otherwise, select No.
| Yes | No | |
| In 2010, total U.S. CO2 emissions were approximately 5707.4 Tg. | ||
| In 2010, U.S. greenhouse gas emissions, not counting CO2 emissions from fossil fuel combustion for electricity generation, were 4563.3 Tg CO2 Eq. | ||
| In 2010, methane emissions in the U.S. were less than 6% of total U.S. greenhouse gas emissions. |
ShowHide Answer
Official Answer
In 2010, total U.S. CO2 emissions were approximately 5707.4 Tg.: Yes
In 2010, U.S. greenhouse gas emissions, not counting CO2 emissions from fossil fuel combustion for electricity generation, were 4563.3 Tg CO2 Eq.: Yes
In 2010, methane emissions in the U.S. were less than 6% of total U.S. greenhouse gas emissions.: No
U.S. Transportation sector: > 5.00%
U.S. Residential sector: < 5.00%
U.S. Commercial sector: < 5.00%
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
45%
(medium)
Question Stats:
73% (01:44) correct
27%
(01:59)
wrong
based on 450
sessions
History
Date
Time
Result
Not Attempted Yet
For each of the following sectors, select > 5.00% if the sector accounted for more than 5.00% of the world’s CO2 emissions in 2010. Otherwise, select < 5.00%.
| > 5.00% | < 5.00% | |
| U.S. Transportation sector | ||
| U.S. Residential sector | ||
| U.S. Commercial sector |
ShowHide Answer
Official Answer
U.S. Transportation sector: > 5.00%
U.S. Residential sector: < 5.00%
U.S. Commercial sector: < 5.00%
78.9%
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
45%
(medium)
Question Stats:
70% (01:15) correct
30%
(01:01)
wrong
based on 429
sessions
History
Date
Time
Result
Not Attempted Yet
3, In 2010, CO2 emissions from fossil fuel combustion in the United States accounted for what percent of total greenhouse gas emissions in the United States?
| 57.8% | |
| 78.9% | |
| 83.6% | |
| 94.4% | |
| 100% |
Attachment:
Untitled.png [ 340.25 KiB | Viewed 6713 times ]
18 Dec 2023, 15:21
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Official Explanation
Statement: In 2010, total U.S. CO2 emissions were approximately 5707.4 Tg.
In 2010, fossil fuel combustion accounted for 94.4% of CO2 emissions in the United States (Tab 1), and total CO2 emissions from fossil fuel combustion were 5387.8 Tg (Tab 2). Thus, if x were the total CO2 emissions, then:
5387.8=94.4%x
\(x=\frac{5387.8}{94.4} 100\)
x=5707.4
Answer: Yes
Statement: In 2010, U.S. greenhouse gas emissions, not counting CO2 emissions from fossil fuel combustion for electricity generation, were 4563.3 Tg CO2 Eq.
In 2010, total U.S. greenhouse gas emissions were 6,821.8 Tg CO2 Eq. (Tab 1). Total CO2 emissions from fossil fuel combustion for electricity generation equaled the sum of CO2 emissions from fossil fuel combustion for electricity generation for each of the four end-use sectors. This sum is:
(4.5+637.6+843.5+772.9) Tg CO2 Eq. 2258.5 Tg CO1 Eq.
The difference between 6821.8 and 2258.5 is 4563.3, which is the number of Tg CO2 Eq. of U.S. greenhouse gas emissions, not counting CO2 emissions from fossil fuel combustion for electricity generation.
Answer: Yes
Statement: In 2010, methane emissions in the U.S. were less than 6% of total U.S. greenhouse gas emissions.
From Tab 1 you know that fossil fuel combustion accounted for 94.4% of CO2 emissions in 2010, and that CO2 represented approximately 83.6% of total greenhouse gas emissions. Therefore, CO2 emissions from fossil fuel combustion accounted for 83.6% times 94.4% of total greenhouse gas emissions in the United States. That figure is 78.9%.
Answer: No
Statement: In 2010, total U.S. CO2 emissions were approximately 5707.4 Tg.
In 2010, fossil fuel combustion accounted for 94.4% of CO2 emissions in the United States (Tab 1), and total CO2 emissions from fossil fuel combustion were 5387.8 Tg (Tab 2). Thus, if x were the total CO2 emissions, then:
5387.8=94.4%x
\(x=\frac{5387.8}{94.4} 100\)
x=5707.4
Answer: Yes
Statement: In 2010, U.S. greenhouse gas emissions, not counting CO2 emissions from fossil fuel combustion for electricity generation, were 4563.3 Tg CO2 Eq.
In 2010, total U.S. greenhouse gas emissions were 6,821.8 Tg CO2 Eq. (Tab 1). Total CO2 emissions from fossil fuel combustion for electricity generation equaled the sum of CO2 emissions from fossil fuel combustion for electricity generation for each of the four end-use sectors. This sum is:
(4.5+637.6+843.5+772.9) Tg CO2 Eq. 2258.5 Tg CO1 Eq.
The difference between 6821.8 and 2258.5 is 4563.3, which is the number of Tg CO2 Eq. of U.S. greenhouse gas emissions, not counting CO2 emissions from fossil fuel combustion for electricity generation.
Answer: Yes
Statement: In 2010, methane emissions in the U.S. were less than 6% of total U.S. greenhouse gas emissions.
From Tab 1 you know that fossil fuel combustion accounted for 94.4% of CO2 emissions in 2010, and that CO2 represented approximately 83.6% of total greenhouse gas emissions. Therefore, CO2 emissions from fossil fuel combustion accounted for 83.6% times 94.4% of total greenhouse gas emissions in the United States. That figure is 78.9%.
Answer: No
18 Dec 2023, 15:25
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Official Explanation
Statement: U.S. Transportation sector
From Tab 1 you know that “globally, approximately 30,313 Tg of CO2 were added to the atmosphere through the combustion of fossil fuels in 2010.” Tab 2 gives you the figures for the CO2 emissions from fossil fuel combustion by each enduse sector. Transportation emitted 1750.0 Tg of CO2. If this number is x percent of 30,313, then:
1750=x%(30,313)
\(x=\frac{1750}{30,313} 100\)
x=5.77
In other words, the U.S. Transportation sector emitted approximately 5.77% of the world’s CO2 emissions through the combustion of fossil fuels in 2010.
Answer: Yes
Statement: U.S. Transportation sector
Follow the same process as in Question 9.1, and you’ll find that the 1183.7 Tg of CO2 that the U.S. Residential sector emitted in 2010 was 3.90% of the world’s CO2 emissions through the combustion of fossil fuels in 2010.
Answer: No
Statement: U.S. Commercial sector
Follow the same process as in Question 9.1, and you’ll find that the 997.1 Tg of CO2 that the U.S. Commercial sector emitted in 2010 was 3.29% of the world’s CO2 emissions through the combustion of fossil fuels in 2010.
Answer: No
Statement: U.S. Transportation sector
From Tab 1 you know that “globally, approximately 30,313 Tg of CO2 were added to the atmosphere through the combustion of fossil fuels in 2010.” Tab 2 gives you the figures for the CO2 emissions from fossil fuel combustion by each enduse sector. Transportation emitted 1750.0 Tg of CO2. If this number is x percent of 30,313, then:
1750=x%(30,313)
\(x=\frac{1750}{30,313} 100\)
x=5.77
In other words, the U.S. Transportation sector emitted approximately 5.77% of the world’s CO2 emissions through the combustion of fossil fuels in 2010.
Answer: Yes
Statement: U.S. Transportation sector
Follow the same process as in Question 9.1, and you’ll find that the 1183.7 Tg of CO2 that the U.S. Residential sector emitted in 2010 was 3.90% of the world’s CO2 emissions through the combustion of fossil fuels in 2010.
Answer: No
Statement: U.S. Commercial sector
Follow the same process as in Question 9.1, and you’ll find that the 997.1 Tg of CO2 that the U.S. Commercial sector emitted in 2010 was 3.29% of the world’s CO2 emissions through the combustion of fossil fuels in 2010.
Answer: No
