Discussion
Assertion (A) : According to IPCC 6th assessment report, if the temperature rise passes 1.5°C, entire ecosystem in polar, coastal and mountain region will be forever lost.
Reason (R) : The consistent emission of greenhouse gases leads to increase in the intensity of greenhouse effect.
Codes :
Answer: A
The key gives (A): both statements are true and the Reason supports the Assertion.
The Reason is sound: continued emission of greenhouse gases raises the concentration of heat-trapping gases and so strengthens the greenhouse effect and warming. The Assertion is a strong paraphrase of the IPCC Sixth Assessment Report, which finds that warming beyond about 1.5°C brings a risk of irreversible losses in ecosystems such as polar, mountain and coastal ones, with some already near their limits to adapt.
Note that the Assertion says the entire ecosystem will be forever lost, which is stronger than the report's wording of risk and irreversible impacts on some ecosystems. The key treats it as true and the rising temperature caused by the Reason as its basis, so (A) is the keyed choice. Options C and D declare one statement false, and B says the Reason does not account for the Assertion, which the key does not accept.
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