ThethinbluelineofourplanetthatwecanseefromspaceiswhatmakesourEarthuniqueinthewholeuniverse.Theoxygenintheatmospheresustainalllifeformontheplanet.SeehowaflyingriverinSouthAmerica,ashiftingdust-stormthroughtheAtlantic,collapsingglaciersintheArcticandthetiniestyetthemostcrucialcreatureintheworldhelpusalljusttobreathe.
非凡地球在线观看，由
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