Greenhouse Gas w1

What has been the trend in greenhouse gas (GHG) emissions from human activities as shown in the graph from 1850 to 2019?

• GHG emissions have decreased steadily

• GHG emissions have remained constant

• GHG emissions have fluctuated without a clear trend

• GHG emissions have continued to increase

According to the data, how does the average annual GHG emissions growth rate between 2010 and 2019 compare to the rate between 2000 and 2009?

• It was higher in 2010-2019

• It was lower in 2010-2019

• It was the same in both periods

• The data does not specify the rates

Which greenhouse gas has driven approximately 25% of radiative forcing since 1750, according to the information provided?

• Carbon dioxide

• Methane

• Nitrous oxide

• Non-CO2 emissions

What is the relative contribution of carbon dioxide to the warming measured in degrees Celsius since 1750?

• 0.4°C

• 0.1°C

• 1.1°C

• 25%

What is the Global Warming Potential (GWP) of methane for a 20-year time horizon (GWP20)?

• A) 81

• B) 27

• C) 30

• D) 83

How long is the atmospheric lifetime of methane?

• A) 12 years

• B) 20 years

• C) 100 years

• D) 50 years

What does the new metric GWP* indicate about methane?

• A) It treats methane as a long-lived climate pollutant.

• B) It indicates methane has no impact on climate.

• C) It links the temperature impacts of methane to a pulse emission of carbon dioxide.

• D) It suggests methane increases global warming indefinitely.

According to the document, reducing methane emissions quickly results in:

• A) No change in atmospheric concentrations.

• B) Increased global warming.

• C) Rapid decreases in atmospheric concentrations.

• D) Steady rates of methane emissions.

Under the GWP100 metric, if a farmer reduces herd size by 1, this is equivalent to removing how much CO2 per year?

• A) 210 CO2

• B) 8.4 CO2

• C) 2.8 CO2

• D) 17.0 CO2

What is the primary effect of increases in atmospheric greenhouse gases according to the summary?

• Decrease in global temperatures

• Enhanced greenhouse effect

• Reduction in carbon dioxide levels

• Increase in aerosol production