Actually by far the best way to lower your carbon footprint is to not have kids lol.
I've always felt the climate issue is murky. There are long cycles the earth goes through with which we have no firsthand knowledge of, we've got some data and can speculate this or that. That being said it's probably naive to think we can increasingly dump these gases into the atmosphere and it will have no effect whatsoever.
Probably not much point in worrying too much about it. Too many assholes making money off of the way things are and if the earth thinks we're a threat, as George Carlin said "The planet’ll shake us off like a bad case of fleas."