Question:
Among the major green house gases ______________ contributes about 60 per cent of total warming
Among the major green house gases ______________ contributes about 60 per cent of total warming
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Always distinguish between concentration and potency. $CO_{2}$ is the "leader" in concentration; $SF_{6}$ or CFCs are "leaders" in per-molecule potency.
Updated On: Aug 20, 2026
- $CO_{2}$
- $CH_{4}$
- $N_{2}O$
- CFC's
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The Correct Option is A
Solution and Explanation
Step 1: Understanding the Question:
The question asks to identify the greenhouse gas (GHG) that has the largest overall contribution to global warming due to its sheer concentration in the atmosphere.
Step 2: Detailed Explanation:
• While gases like Methane ($CH_{4}$) and Nitrous Oxide ($N_{2}O$) have a higher "Global Warming Potential" (they are more powerful per molecule), Carbon Dioxide ($CO_{2}$) is present in much larger quantities due to the massive burning of fossil fuels, deforestation, and industrial processes.
• According to various IPCC reports, $CO_{2}$ accounts for approximately 60% to 75% of the total radiative forcing (warming effect) caused by anthropogenic greenhouse gases.
• Forests play a crucial role here as they act as "Carbon Sinks," absorbing $CO_{2}$ during photosynthesis and storing it as biomass. This makes forestry and agroforestry vital strategies for climate change mitigation.
• Methane contributes about 15-20%, while CFCs and Nitrous Oxide contribute the remainder. $CO_{2}$ remains the primary target for global climate policy and carbon credit mechanisms.
• The long atmospheric lifetime of $CO_{2}$ means that current emissions will continue to affect the global temperature for centuries.
Step 3: Final Answer:
$CO_{2}$ contributes about 60 per cent of total warming.
The question asks to identify the greenhouse gas (GHG) that has the largest overall contribution to global warming due to its sheer concentration in the atmosphere.
Step 2: Detailed Explanation:
• While gases like Methane ($CH_{4}$) and Nitrous Oxide ($N_{2}O$) have a higher "Global Warming Potential" (they are more powerful per molecule), Carbon Dioxide ($CO_{2}$) is present in much larger quantities due to the massive burning of fossil fuels, deforestation, and industrial processes.
• According to various IPCC reports, $CO_{2}$ accounts for approximately 60% to 75% of the total radiative forcing (warming effect) caused by anthropogenic greenhouse gases.
• Forests play a crucial role here as they act as "Carbon Sinks," absorbing $CO_{2}$ during photosynthesis and storing it as biomass. This makes forestry and agroforestry vital strategies for climate change mitigation.
• Methane contributes about 15-20%, while CFCs and Nitrous Oxide contribute the remainder. $CO_{2}$ remains the primary target for global climate policy and carbon credit mechanisms.
• The long atmospheric lifetime of $CO_{2}$ means that current emissions will continue to affect the global temperature for centuries.
Step 3: Final Answer:
$CO_{2}$ contributes about 60 per cent of total warming.
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