By not having your own kid and  adopting you are helping population control

By having just 1 kid, you are helping the world to reduce resources consumption and reduce population

By have just 2 kids, you are neither harming nor helping the society. You are just replacing you and your spouse with two kids.

By have 3 kids, you are being little selfish and taking more resources than what you should

By having 3+, you are just a selfish


Just an opinion...not the truth.