> Consider this question - look outside at a tree. Where did all the carbon in the tree come from?

I assume that you are referencing the famous 1983 interview with Feynman, in which he playfully says that "trees come out of the air!" For anyone who hasn't heard the interview, it's definitely worth a listen: https://www.npr.org/sections/krulwich/2012/09/25/161753383/t...