Question

CNG is considered clean fuel compared to wood. why?

Answer 1

CNG produces lesser amount of greenhouse gases as compared to wood. hence it is a cleaner fuel.

*hope it helps you.

Answer 2

One reason natural gas is called “clean” is because it emits 50 percent less carbon dioxide than coal when you burn it. Thus it's seen by some as a “bridge” fuel until zero-carbon-producing renewables can take over. But natural gas isn't clean in the way that solar is clean. It's clean-er than coal.