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absorbed acid activities agricultural altitude Andhra Pradesh animals areas atmosphere bacteria biological breeds camel carbon carbon dioxide cent chemical cities conservation crops cultivation Delhi dioxide disease earth ecological economic effect energy environment environmental epilimnion erosion eutrophication factors fodder forest department forest lands forestry fuel genetic resources grazing lands groundwater groups growth Gujarat hazards headloaders hectares household humus Hyderabad hypolimnion important increase India irrigation Kunbis labour lakh layer living Madhya Pradesh major materials migration million hectares natural needs nitrate nitrogen nutrients occur organic matter oxidation oxygen ozone particles percent photosynthesis plants pollution population precipitation problems production programmes radiation Rajasthan reaction region rehabilitation result rice river rural Sahiwal slum social forestry soil species surface Tehri Tehri dam temperature thermosphere tonnes trees tribals troposphere ultraviolet urban Uttar Pradesh vapor varieties vegetation villages women wood zone