[torstenvl]

On any given machine, Rust compilation consumes comparatively more power.

Also, I doubt mere mortals can compile Rust software for PowerPC OS X. LLVM IR isn't backward compatible and Darwin/PPC hasn't been a supported target for a while. If you used a 2018 rustc and LLVM 7.x you might get lucky.

[sgt]

But will all the Rust compilations in the world actually have an impact on global warming?

[torstenvl]

No individual drop in the ocean is responsible for a tsunami.