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5 TAKING CARE OF OUR PLANET
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The air pag. 180
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What pollutes every breath we take pag. 180
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Water pag. 185
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Heavy metals in the environment pag. 186
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Soil microbiology pag. 186
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Energy changes pag. 190
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Nature helps us to clean air, soil, water and … do the laundry pag. 193
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Biological fuel generation pag. 202