Asked by help()!!!!!

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.






Answered by bobpursley
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.
Answered by ajay
burning of petrol
Answered by docter
burning of cow dung.(4.)
Answered by Gurleen
Burning of cow dung
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