Yes you can but you'll have to vote against your immediate self interest and comfort. The sort of changes that will have an impact on the climate will mean giving up a lot of what makes modern life convenient and comfortable.

Entirely depends on your district. There are many districts where it doesn't matter, especially with gerrymandering.

Better to volunteer for a swing district. You can write letters or fundraise from home, anywhere in the country.

Both parties in the United States are pretty much turning a blind eye to climate change. What we need to do is start boycotting parties, telling them we won’t vote for them unless they have really strong climate platforms. We need to make them want our vote.