Environmental Engineering in CE
The progressive warming up of the earth's surface is mainly due to the

Thickening of ozone layer
Automobile exhaust
De-forestation
Blanketing effect of CO₂ in the atmosphere

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Environmental Engineering in CE
Coal mines drainage waste water (acidic in nature) results from the earth's water percolating through the voids created in coal bed during mining. This polluted water which either drains out naturally to water courses or are removed before starting the mining is

Neutralised by alkali treatment
Left as such without any treatment
Diluted with fresh water to reduce its acidity
None of these

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