Climate Change MCQs Set 21 (200+ Questions with Ansers) Posted on March 24, 2026March 31, 2026Author agropublishers 0 Table of Contents Toggle Climate Change MCQs Set 21 (200+ Questions with Answers)1. Climate variability typically operates over which time scale? Years to decades Seconds Minutes Centuries 2. If nitrous oxide (N₂O) emissions are 2 tonnes, what is the corresponding CO₂-equivalent (GWP₁₀₀ ≈ 265)? 600 tCO₂e 700 tCO₂e 530 tCO₂e 400 tCO₂e 3. Hydroxyl (OH) radicals are often referred to as the atmosphere’s _____________ Cleansing agents Energy source Cooling agents Greenhouse gases 4. A positive radiative forcing indicates _____________ No change in energy balance Net energy loss from the Earth system Cooling of the Earth system Net energy gain by the Earth system 5. Reducing emissions of 1 tonne of N₂O is approximately equivalent to a reduction of how much CO₂ (in CO₂-equivalent, GWP₁₀₀ basis)? 210 tCO₂e 28 tCO₂e 386 tCO₂e 265 tCO₂e 6. Anthropogenic forcing differs from natural forcing because it _______ Is periodic Is driven by solar variability Is negligible Results from human activities 7. Longwave radiation in the Earth system primarily originates from ______________ Sun Stars Earth’s surface Atmosphere 8. Permafrost thaw contributes to climate tipping primarily through __________ Release of CO₂ and CH₄ from previously frozen organic matter Increased albedo Enhanced nitrogen fixation Reduction in soil respiration 9. Climate thresholds are important because they can ___________ Increase surface albedo Stabilize the climate system Reduce greenhouse gas emissions Trigger abrupt and potentially irreversible changes 10. Climate change driven imbalance in Earth’s energy budget (radiative imbalance) primarily results in ___________ Accumulation of heat in the climate system Wind formation Rainfall changes Atmospheric pressure changes Loading … Question 1 of 10Climate Change MCQs Set 21 (200+ Questions with Answers) Climate Change MCQs Set 21 (200+ Questions with Answers) 1. A positive radiative forcing indicates _____________ Cooling of the Earth system Net energy gain by the Earth system No change in energy balance Net energy loss from the Earth system 2. Reducing emissions of 1 tonne of N₂O is approximately equivalent to a reduction of how much CO₂ (in CO₂-equivalent, GWP₁₀₀ basis)? 265 tCO₂e 386 tCO₂e 28 tCO₂e 210 tCO₂e 3. Climate variability typically operates over which time scale? Years to decades Minutes Seconds Centuries 4. Hydroxyl (OH) radicals are often referred to as the atmosphere’s _____________ Greenhouse gases Cleansing agents Energy source Cooling agents 5. Permafrost thaw contributes to climate tipping primarily through __________ Increased albedo Release of CO₂ and CH₄ from previously frozen organic matter Enhanced nitrogen fixation Reduction in soil respiration 6. If nitrous oxide (N₂O) emissions are 2 tonnes, what is the corresponding CO₂-equivalent (GWP₁₀₀ ≈ 265)? 400 tCO₂e 530 tCO₂e 700 tCO₂e 600 tCO₂e 7. Climate thresholds are important because they can ___________ Reduce greenhouse gas emissions Increase surface albedo Stabilize the climate system Trigger abrupt and potentially irreversible changes 8. Anthropogenic forcing differs from natural forcing because it _______ Results from human activities Is driven by solar variability Is negligible Is periodic 9. Climate change driven imbalance in Earth’s energy budget (radiative imbalance) primarily results in ___________ Rainfall changes Accumulation of heat in the climate system Atmospheric pressure changes Wind formation 10. Longwave radiation in the Earth system primarily originates from ______________ Sun Atmosphere Earth’s surface Stars Loading … Question 1 of 10 Climate Change MCQs Set 21 (200+ Questions with Answers)
