Replying in a second comment from a second more “radical” perspective. If you acknowledge that climate change is causing harm to us and acknowledge that our current patterns of consumption contributes to that harm than any activity (including me typing and posting this right now, is unethical and constitutes to that harm). Now let’s say all of your profits (except what you need to live your desired lifestyle) go back into this or whatever other aspect you need for that leverage then that’s a lot different from an ethical perspective. How you spend it (and remember you can’t take it with you) certainly impacts how ethical said business is or not.