If you want a better climate there's a fucking Green Party. You don't have to vote for the second worst party. It's not about sending a message it is about not manufacturing consent for the duopoly. By voting for the democrats you are telling them you approve of genocide and that the tiny bit better climate policy is good enough.
The democrats are all still heavily invested in fossil fuels. The democrats don't give a fuck about climate change and are actively genocidal. They do the bare minimum on climate issues and idiots like you eat it up.