>THERE IS TWO
For AI your grammar is shit.
Fucking NASA…
>Living creatures produce most of the methane on Earth.
Maybe they purposely do not distinguish between in earth and on earth, then the above statement is technically correct.
I dunno there are all kinds of theories….
https://courses.seas.harvard.edu/climate/eli/Courses/EPS281r/Sources/Origin-of-oil/The%20Origin%20of%20Methane%20(and%20Oil)%20in%20the%20Crust%20of%20the%20Earth.pdf