I partly agree but I do think you have cause and effect (or disease and symptom if you will) swapped around. You‘re saying people don‘t do boycotts because they are futile. I would say it‘s the other way around and to answer OPs question, I think it largely comes down to commodity and mindlessness. But either way I think you are definitely right to suggest there must be systemic change and that all of this co2 compensation bullshit is just corporations guilt-tripping us into thinking we can consume our way out of this mess. However, the problem is that both approaches, the personal boycotts and the systemic change share a common factor, which is the requirement of mass action. If people aren‘t mindful enough to stop buying a particular kind of yoghurt, how are you ever going to get them to vote, much less stage a revolution? I think we need to get out of our passivity and boycotting things is a step in the right direction to establish a feel for personal agency.