നോൺ-ബയോഡീഗ്രേഡബിൾ മലിനീകരണം സൃഷ്ടിക്കുന്നത് ആര് ?
Aപ്രകൃതി
Bവിഭവങ്ങളുടെ അമിതമായ ഉപയോഗം
Cമനുഷ്യർ
Dപ്രകൃതി ദുരന്തങ്ങൾ.
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