"Vote for the green party" in my country would, in many ridings, be the difference between the only climate-change-denying party winning a seat, and one of the three climate-change-believing-and-respond-to-it parties winning a seat. Which is less than helpful when it comes to addressing climate change.
I'm pretty sure you can do other things as well as Vote. It's not like voting is so all encompassing that you'd be unable to work/participate in other areas at the same time.
I wasn't suggesting that, I was just responding to the parent comment. Voting for the green party can actually cause anti-environmental outcomes (in my jurisdiction).