@evan Of course. But I think the symbolic power of one Greta Thunberg has the potential to be much larger than that of one donor, voter, or purchaser.
If you aren't uniquely positioned for one of the other roles, e.g. you're not a Kennedy or other political dynasty that can definitely claim an influential role in govt...
If you're in an area that is gerrymandered, or where there are no green options to purchase, etc...
Direct action or civil disobedience can be done alone.