The scientific view is that the increase in global temperature should not exceed 2 degrees Celsius above pre-industrial level. If the global temperature increases beyond 3 degrees Celsius 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.

1. Terrestrial biosphere tends toward a net carbon source — Correct. With warming beyond about 3°C, forests/soils can release more carbon through respiration, fires and dieback than they absorb.

2. Widespread coral mortality will occur — Correct. Coral reefs are highly temperature-sensitive; sustained warming causes mass bleaching and large-scale mortality.

3. All the global wetlands will permanently disappear — Incorrect. Climate change threatens many wetlands, but saying all wetlands will permanently disappear is an extreme and factually unsound claim.

4. Cultivation of cereals will not be possible anywhere in the world — Incorrect. Yields may decline sharply in many regions, but cereal cultivation will not become impossible everywhere.

Hence, statements 1 and 2 only are correct.