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which of the following is more eco-friendly than the others?
1.Burning of Petrol
2.Burning of COAL.
3.Burning of Charcoal
4.Burning Of Cowdung.

  • science -

    Isn't cowdung a waste product? Petrol, and coal are non renewable fuels, charcoal is made from trees. In general, trees are nice to the environment and we don't want to burn them.

  • science -

    burning of petrol

  • science -

    burning of cow dung.(4.)

  • science -

    Burning of cow dung

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