Its not about one person preventing climate change alone, first step is not supporting climate change. Then people around you see that it’s not black magic and that they can do it too. We are now at 2%, 3%? vegans. A change in society needs 10% to have a critical mass. If you decide to go vegan, for the animals, for the climate, for your health, and make others think about and maybe even change one other persons view you did better than most.
If you don’t you are not passive, you are actively supporting it and showing others that its OK.
Eating meat is actively supporting the industry and everything that comes with it.
Silently not supporting it with a plant based diet is the passive position.
Actively fighting against it is the real fight against the industry.
Governments will not act against the will of the voters alone. They have to have some support to even consider making change. Massive organizations live from the participation from people, from you.