Multiple choice

What is the gradual reduction in the amount of direct irradiance at the Earth's surface called?

  1. Anti-greenhouse effect

  2. Global cooling

  3. Twomey effect

  4. Global warming

  5. Global dimming
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E Correct answer
Explanation

Global dimming is the gradual reduction in the amount of global direct irradiance at the Earth's surface that was observed for several decades after the start of systematic measurements in the 1950s. The effect varies by location, but worldwide it has been estimated to be of the order of a 4% reduction over the three decades from 1960–1990.

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