I mean "good" in the sense of long-term achievement of reasonably high quality of life for humanity, without a collapse in human population. (My understanding is that if there are no catastrophes, the current trajectory is expected to level out somewhere around 11 billion. Of course, if we also happen as a species to make radical progress on life extension, that will also have to weigh in to long-term changes in reproductive behaviour, etc.)

Of course we should all do what we can. (I eat less meat than I used to, and don't drive.)