One of the high-growth sectors in most american's 401k's is "Energy". This is a euphemism for fossil fuel companies, such as Shell, BP, and the various supporting industries. Another high-growth sector is "home construction," which is literally an industry that exist to pave over paradises and put in parking lots creating sprawling suburbs in it's wake that are owned by companies like Blackrock.

To be fair, you can't really get away from that, especially since you don't really have the ability to manage your 401k that way. But passive growing investments absolutely feed Capitalism and directly contribute to the massive polluters.