| The scientific view is that the increase in global temperature should not exceed \[2{}^\circ C\] above pre-industrial level. If the global temperature increases beyond \[3{}^\circ C\]above the pre-industrial level, what can be its possible impact/impacts on the world? |
| 1. Terrestrial biosphere tends towards 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 codes given below. |
A) Only 1
B) 1 and 2
C) 2, 3 and 4
D) All of these
Correct Answer: B
Solution :
Exp. [b] Carbon is cycled through the terrestrial biosphere increase in global temperature will cause increase in evapotranspiration, which acts to reduce soil water content leading to 80% reduction of net land \[C{{O}_{2}}\] uptake. As a result tropical carbon storage saturates by the end making some region sources of \[C{{O}_{2}}\] (is net carbon source). Global warming is expected to accelerate the rate of sea-level rise by expanding ocean water and melting alpine glaciers.
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