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