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21 September, 01:55

Which one of the following statements is true?

1. Burning coal contributes to sulfur aerosols in the stratosphere; these sulfur aerosols have moderated global warming.

2. Sulfur compounds released into the atmosphere have relatively short lifetimes of only an hour or two.

3. Volcanoes are an anthropogenic source of sulfur compounds.

4. The widespread use of nuclear energy has released significant amounts of sulfur dioxides that have made their way into the stratosphere.

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  1. 21 September, 04:53
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    1. Burning coal contributes to sulfur aerosols in the stratosphere; these sulfur aerosols have moderated global warming.

    Explanation:

    Sulfur aerosols both absorb as well as scatter solar radiation coming from the sun, thus saving the earth from getting wormed up. In this way it has moderating effect on the global warming. This is also called global dimming effect. Less of the solar radiation is able to reach earth surface due to these aerosol.
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