Nope, there are other ways to take action. Have time to spare? Volunteer for local environmental groups (here’s a list). Are you artistic and social media savvy? Design compelling social media posts on environmental issues to educate the public (just make sure your references are reliable and that you credit the source).
Are there grants you can access? Conduct research. Know of an unused space? Reclaim it to plant trees. Have a way with words? Write to your local government or start a petition to propose a policy change. The sky’s the limit!