I'll start out with the most damning response to the "footprint" concept: carbon footprint is almost entirely dictated by your income.
The logic that consumer behaviour puts pressure on corporations is based on the logic of supply & demand based pricing.
The problem is, that's an article of faith and not really supported by the evidence. When you put that theory to the test the evidence shows that pricing follows a model where companies effectively dictate their prices to you. It doesn't follow supply and demand.
This is an interview of two economists on this topic: https://www.iheart.com/podcast/105-it-could-happen-here-30717896/episode/everyone-else-admits-we-were-right-122933018/
They also skewer the whole institution of orthodox economics here. I found it quite cathartic.
But the upshot of this is, in my opinion, the only way to reduce your personal carbon footprint is to make yourself "poor" at least as far as the economy is concerned. That may sound impossible, but I think it dovetails nicely with my own politics of building mutual aid networks, where people create alternative methods of directly meeting one another's needs and help wean one another off our dependence on capital and the state.
That isn't consumer activism as much as it is anti-consumer, and that's kind of incidental to its primary goal to create a political body that undermines the entire machinery of capitalism whilst educating common people on how to run a world for and by themselves.