Question

Why are wood and coal inefficient fuels

Answer 1

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$\tt\large\green\rightarrow$Further, wood burns cleanly, while coal smoke is considered dirty. If you do use coal, anthracite is a relarively clean-burning fuel with a low sulfur content. Because it is the hardest of coals, anthracite is also less prone to crumbling and consequently is less dusty.

Answer 2

Answer:

Coal and Wood are Exhaustable fule, Both the fules emmit more CO2 and leave more residue in foem of ash. The gas released from incomplete combustion of Coal causes emmission of Carbon monoxide and other toxic gases. Wood comes from trees and cutting of trees have drastic effect in the ecosystem and human lively hood.Useage of CNG,LPG is preffered as they don't release much harmful gases.