I would also like to add that some countries could contribute more by offering public transit infrastructure (like, at all - looking at you "deep south of the United States", where cities don't have any transit systems, whatsoever) and encouraging/subsidising/what-have-you of far more rail use than plane use.

Essentially, you're never going to drive car use down (and, thereby, fossil fuel use), if there are no viable alternatives than using a car and the poorest areas can't afford to "catch-up" to the electic vehicle trend[s].

Yes, the effect might be miniscule, compared to the output of CO^2 by businesses, but every little bit helps - when deforestation continues in the Amazon (e.g.: "the world's lungs") and we're not planting enough trees (anywhere) to counter-act that.