'Global Dimming' means

  1. gradual reduction in the amount of global direct irradiance at the earth surface
  2. gradual loss of biodiversity hot spots
  3. gradual increase in the melting of ice in polar regions
  4. gradual increase of the temperature of ionosphere

Answer

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 correct option is A.

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