Scenario CO₂ Is Not the Only Greenhouse Gas (GHG)that Impacts Global

question 25

Multiple Choice

Scenario
CO₂ is not the only greenhouse gas (GHG) that impacts global climate change. Other GHGs may be equally or more effective than CO₂ at trapping heat on Earth. Climate scientists determine how much a GHG may impact global warming based on two factors: the efficiency with which a GHG absorbs energy (i.e., traps heat on Earth) and the length of time (in years) that the gas remains in the atmosphere. A unit of measurement called the Global Warming Potential (GWP) is used to describe how much energy a GHG absorbs over a specific period of time (100 years is a standard time frame) . All GWP values of GHGs are compared to the GWP of CO₂, which is given a value of 1.
-CH₄ has a GWP over 20 times higher than CO₂. However, CH₄ emitted today lasts for only about a decade in the atmosphere, while the GWP of CO₂ can last for thousands of years. What is a possible reason that CH₄ can have such a high GWP as compared to CO₂?

• A)The 100-year time frame is too short of a time frame to compare CH₄ and CO₂.
• B)CH₄ absorbs more energy than CO₂.
• C)CH₄ is less efficient at trapping heat on Earth.
• D)CH₄ is not a proven greenhouse gas.

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