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Global dimming is the reduction in the amount of global direct irradiance at the Earth's surface that has been observed since systematic measurements began in the 1950s. The effect varies by location, but worldwide it has been estimated to be of the order of a 4–20% reduction.

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atheamoreno7

Answer:

is the reduction in the amount of global direct irradiance at the earth surface that has been observed since systematic measurements began in the 1950.

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