sulphur dioxide - iu hdseoxdilpur, acid rain - nciairda, pollution - lpontouil, hydrocarbons - dsybahcnorro, carbon monoxide - aondeoonixbmcr, ozone - zoeon, calcium carbonate - icrnal atocbaucem, greenhouse effect - heoeetuefserfgcn, global warming - lanrmwbgliag o,

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