Explanation

Option D is correct: Both methods represent solar radiation management and thermal radiation intervention techniques under the umbrella of solar geoengineering (climate engineering) aimed at mitigating or reducing global warming:

– Stratospheric Sulfate Aerosol Injection: Involves dispersing reflective sulfate particles into the stratosphere to mimic volcanic eruptions, increasing planetary albedo by scattering incoming shortwave solar radiation back into space.
– Cirrus Cloud Thinning: Targets high-altitude cirrus clouds that trap outgoing longwave infrared radiation. Thinning these clouds with aerosol seeding allows more heat energy to escape directly into space, cooling the Earth.

Therefore, these proposals aim at Reducing the global warming — Option D.