The scientific view is that the increase in global temperature should not exceed 2 °C above the pre-industrial level. If the global temperature increases beyond 3°C above the pre-industrial level, what can be its possible impact/impacts on the world?
- Terrestrial biosphere tends toward a net carbon source
- Widespread coral mortality will occur.
- All the global wetlands will permanently disappear.
- Cultivation of cereals will not be possible anywhere in the world.
Select the correct answer using the code given below.
Detailed Explanation:
✅ Statement 1 – Correct: Beyond 3°C warming, ecosystem tipping points like forest dieback and permafrost thaw cause the terrestrial biosphere to shift from carbon sink to carbon source, releasing more CO₂ than absorbed.
✅ Statement 2 – Correct: Coral reefs face 99% loss at 2°C warming; at 3°C, widespread coral mortality becomes catastrophic and irreversible globally.
❌ Statement 3 – Incorrect: The term "all wetlands" and "permanently disappear" is extreme; many wetlands would be severely degraded or lost, but complete global disappearance is scientifically implausible.
❌ Statement 4 – Incorrect: The term "anywhere in the world" is an overstatement; while cereal cultivation would face severe disruption and crop failures, high-latitude regions might still support limited production.
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