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Marine cloud brightening as a geoengineering proposal would involve

  • A.releasing sulphate aerosol into the stratosphere
  • B.removing carbon dioxide from the atmosphere by direct chemical means
  • C.spraying sea salt to increase droplet number in marine cloud
  • D.seeding ice nuclei into cirrus at very high altitude

Answer: C

More and smaller droplets raise the albedo of marine stratocumulus by the Twomey effect. It is proposed as a regionally targeted intervention rather than a global one. It acts through cloud rather than directly on sunlight.

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