The scientific view is that the increase in global temperature should not exceed 2 0 C above pre-industrial level. If the global temperature increases beyond 30 C above the pre-industrial level, what can be its possible impact/impacts on the world?
1. Terrestrial biosphere tends toward a net carbon source.
2. Widespread coral mortality will occur.
3. All the global wetlands will permanently disappear.
4. Cultivation of cereals will not be possible anywhere in the world.
Select the correct answer using the code given below:
Explanation
Statement 1 is Correct: At >3°C rise, forests and soils release more CO₂ than they absorb, becoming a net carbon source.
Statement 2 is Correct: Even 1.5–2°C rise causes coral bleaching; beyond 3°C, widespread coral mortality occurs.
Statement 3 is Incorrect: Wetlands are vulnerable, but not all will disappear; some may shrink, others may expand due to sea-level rise.
Statement 4 is Incorrect: Cereal productivity will decline, but cultivation will still be possible in some regions.
Approach: Statement 3 and 4 are very extreme sentences and can be easily eliminated.