behavior changes, such as driving less or eating less meat, could theoretically cancel out all the greenhouse gas (GHG) emissions an average person produces each year
Driving less and eating less meat means you'd still be driving and eating meat, so how does that work?
I don't understand the downvotes and lack of logical answers. I genuinely don't know what they could be trying to say there. Maybe that an American (way above average in driving and eating meat) could reduce their impact by an amount equal to the total GHG of an average world citizen? But it wouldn't really cancel anything out and why would it be relevant to the rest of what's being said?