In the context of which of the following do some scientists suggest the use of cirrus cloud thinning technique and the injection of sulphate aerosol into stratosphere?
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Answer: D. Cirrus cloud thinning (letting more heat escape to space) and injecting sulphate aerosols into the stratosphere (reflecting sunlight) are proposed geoengineering methods to cool the planet, that is, to reduce global warming.
Watch for: 'Clouds' and 'aerosols' make students think of artificial rain (cloud seeding).
Why the other options are wrong
- A. Wrong because these methods are not meant to cause rain.
- B. Wrong because they are not designed for cyclone control.
- C. Wrong because solar wind is charged particles, which these methods do not address.
Source to check: IPCC Special Report on Global Warming of 1.5 C (2018), sections on solar radiation modification
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