UPSC General Studies Solved Paper - General Studies-2014

  • question_answer
    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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