list any 3 human activities which would lead to an increase in the carbon dioxide content of air?

Asked by simran2 | 22nd Aug, 2010, 12:00: AM

Expert Answer:

The major human sources are:
1.  Combustion of fossil fuels
2.  Liberation of fixed carbon in e.g. forests and soils
3.  Liberation of carbon from limestone in e.g. cement-making

Answered by  | 22nd Aug, 2010, 11:34: PM

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