We could add a multitude of things each of us does or doesn't do, from flying, having children, driving, owning a small/big house, turning up or down the heating, eating meat, planting trees, etc etc.
The reality is it is impossible to compare our contributions, so claiming sainthood on the grounds that you don't fly or only have one child, etc, is meaningless. Only by carrying out a full audit of our total behaviour could we have even the slightest idea or who is contributing more or less.
I take 30 or more individual flights per year, is my contribution to global warming more than any of the other posters here? Possibly yes, probably no. Do I think about my impact on the environment? Yes. Am I seeking to reduce my flying? Nope, four more flights before the year's end.