See, I'm not giving up on anything here. If I went vegan - hell, if my entire country went vegan, not a single cow in the entire world would live in better conditions. Same with emissions, etc. We're a rounding error.
But we have some very good politicians. If I (and enough other people) vote them into our and later the EU parliament, they will in turn vote for things like sanctioning companies for shit that goes down in their supply chain, regulating animal treatment, etc. And that might actually make a difference.
People are way too cynical about politics. Changing your life is great, but it's not what will ultimately decide the outcome of this mess. Politics is where the power lies and if a person in power does not agree with you, no amount of protesting/lifestyle changes is going to make them change their minds. Politicians are not your enemy - bad politicians are. So vote those out and vote the good ones in.