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Posted by on Friday, November 1, 2013 at 8:38am.

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 - , Friday, November 1, 2013 at 9:10am

    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 - , Thursday, November 21, 2013 at 9:13am

    burning of petrol

  • science - , Friday, November 22, 2013 at 10:23pm

    burning of cow dung.(4.)

  • science - , Saturday, November 23, 2013 at 1:15am

    Burning of cow dung

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