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Polar bear, why is your world melting? /

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MARC

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11931

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180820s2008 us a b 000 0 eng d

005		20210712145652.0
020		\|a9780807565995\|q(pbk.) :\|cUS$7.99
040		\|aKCIS\|beng\|cKCIS\|eAACR2
041	0	\|aeng
095		\|aLB\|bLBES\|cE000742\|dE\|eWEL\|pB\|tKCL
100	1	\|aWells, Robert E.
245	10	\|aPolar bear, why is your world melting? /\|cby Robert E. Wells.
260		\|aChicago :\|bAlbert Whitman & Company,\|c2008.
300		\|a1 v. :\|bill., col. ;\|c18x27 cm.
490		\|aWells of Knowledge Science
650	7	\|aGreenhouse effect, (Atmospheric)\|xJuvenile literature\|2lc
650	7	\|aGlobal warming\|xJuvenile literature\|2lc
991		\|aKCIS
993		\|a5.4

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In the Arctic, the summer ice is melting, making it hard for polar bears to survive. Why is the world getting warmer? The heat of the sun is trapped by the -greenhouse- gases that surround Earth--carbon dioxide, methane, nitrous oxide, and water vapor.
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