Question

why is natural gas is called a clean fuel?

Answer 1

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 cleaner than coal.
Hope this helps you.

Answer 2

hey mate here is your answer