The gigatonnes of CO2 linked to a small number of fossil fuel producers are also linked to a very large number of people putting it in their ICE vehicles. People not driving ICE vehicles is clearly going to change that quite a lot...

The list you linked explicitly excludes emissions from agriculture, you are talking about %70 of what they measured, not overall emissions. If everyone stopped eating meat, it would reduce overall global emissions by a third which is hugely significant.

It's not. Not eating meat or driving a hybrid car doesn't help to save the environment, it helps YOU feel better.