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