A soot forcing is unusually effecti
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A soot forcing is unusually effective, which_________
Aproduces much more global warming than a carbon-dioxide forcing of the same magnitude
Bcontributed to 25 percent of observed global warming
Cwinter and spring
Dthe warming effects increase
Estill surpass soot warming the world’s climate during the last century
Fcan be seen mostly in the Northern Hemisphere
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