GyanGramThe scientific view is that the increase in global temperature should not exceed 2 °C above the pre-industria…
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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?
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.
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• Correct Answer: B
• Beyond 3°C warming, the terrestrial biosphere (forests and soils) risks shifting from a net carbon sink to a net carbon source due to increased decomposition and forest dieback. Widespread coral mortality will occur from marine heatwaves and acidification.
• 3 is wrong: Not all wetlands will permanently disappear. 4 is wrong: Cereal cultivation would become impossible in many tropical regions but may still be possible at high latitudes with adaptation.
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