But you're demanding an enormous act with a tiny benefit. It is completely unreasonable for you to complain that someone doesn't meet this standard you made up.
Should I do a dumb analogy? Imagine if they asked for advice on getting fewer under-pressure tires and you suggested buying an entire new car with pressure sensors. And then declared they'll talk the talk but not walk the walk when they refuse that option.
That said, there are plenty of inexpensive used cars out there as well that will be both easier on the environment and safer to drive at no additional charge. For this must be a pre-2000 or so car to not have at least an idiot light for the tires and unless they've treated it lovingly (which seems unlikely) it probably has one tire in the grave already.
You are holding that person to a ridiculous standard. They talk to you about wanting to do something, and if they don't uproot their entire life just to shift a single vote around you're going to pretend they were speaking some enormous talk and now refuse to back it up?