The scientific view is that the increase in global temperature should not exceed 2oC above pre indus...........

Environment and Ecology Envirnment and Climate Change

The scientific view is that the increase in global temperature should not exceed 2^oC above pre-industrial level. If the global temperature increases beyond 3⁰C 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.Wide spread 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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UPSC CSP Previous Year Paper (2014)

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1 only

1 and 2 only

2, 3 and 4 only

1, 2, 3 and 4

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Explanation:

As per IPCC report (IPCC-WG-II, 2007), beyond 3⁰C rise in global temperature above the pre-industrial level will lead to:

Upto 30% of species at increasing risk of extinction,
wide spread coral mortality,
Terrestrial biosphere tends toward a net carbon source Increasing species range shifts and wildfire risk,
Ecosystem changes due to weakening of the meridional overturning circulation.

https://www.who.int/global_health_histories/seminars/presentation39a.pdf?ua=1

Statement 3 and 4 are too extreme and also IPCC report do not highlight any such risk. There will be effects on wetlands and cereal cultivation. But not total disappearance or no cultivation at all.