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It absorbs sun’s heat． It is responsible for climate change． It reflects sunlight． It may account for a quarter of global warming over the past century．
sun’s heating on snow surface． soot’s increased absorption of solar energy． carbon-dioxide’s warming effect． snow’s increased reflection of sunlight．
informed remind described alerted
Pasteur RobertKoch Hansen Leeuwenhoek
accused advanced cautioned counted
Soot Snow Greenhouse gases Wind
Ice sea areas． Areas with black carbon． Areas covered with white snow． Melting glaciers．
X sea ice and insufficient sunlight． light snow cover and sufficient sunlight． heavy snow cover and sufficient sunlight． thick sea ice and insufficient sunlight．
told asked said cautioned
accused advanced cautioned counted
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