The problem is we have a strongly factional two party system where the most productive strategy is to reap hatred between the factions. This is mostly a consequence of our plurality voting system.
We also have a political environment that tries to gloss over the ways the two parties are similarly problematic and damaging while championing the idea that "we're the party of all things good and right and the other people are responsible for all bad positions".
Dems and Republicans alike support carbon emitting methods of power generating that result in over a million deaths a year worldwide. Voting for Trmp vs Bden probably doesn't have any real appreciable effect on worldwide pollution levels.
