Okay, I really don't want to offend anyone so take this as you will. I grew up in the outskirts of the biggest city in Arkansas: Little Rock (pop. 170,000 -at the time). Bible belt, narrow minded area, (and no joke, just 5 miles away from the KKK headquarters). I was lucky to be an odd ball in that area, I grew up going to a private school in town and was not exposed to the culture of the people living around us when I was very young. I am not trying to be stereotypical but I have also noticed in areas like this, a certain ignorance towards environmental and especially global issues. Here is my point: if I choose to not have children because of the global issue of overpopulation, then my values in a sense end with me. If everyone else around us, people who do not care for the global situation, believe that they should have infinite numbers of children, then they continue to spread that mindset to the next generation. Who in that generation will be there to fight for our cause then?
I find myself fighting so hard to convince people that there is a serious crisis going on on our planet, and most people don't want to know or believe it exists. Because this fight is so great, it makes me want to do my best to teach people. I realize that there are other ways to spread the information, but I just can't get rid of this fear that if we give up the chance to raise our own children to live with care, then no one will be there to continue our legacy. Clearly, someone along the way influenced me, I did not get my world view from my parents at all, in fact I am the one changing their world view, but I think this an exception not a rule. (Although, our family is slowly shrinking already just from generational differences, I have one brother, my parents have 4 siblings each, my grandparents had as many as 12 siblings each)
That being said, I have considered adoption. I am not ready at the moment for kids, it will probably be another 3-5 years, but I will continue to be troubled by this decision until then. I also have the mindset that with 2 children, I have replaced myself and my partner, and therefore have not added anymore lives than will be taken out when we die.
(Of course that theory doesn't work because of the much larger families that exist, but I feel like at that point I have done my part, and we just need to work on convincing others to do theirs. I realize that having children is a right, and I don't necessarily think that the government should be telling you how to raise your family which is why I think we need to do it through education. But in all honesty, there are too many religions that do not allow the use of birth control and I don't think people will be willing to go against their faith in some cases.)
Conclusion: Yes I will control my number of children in hopes of making a tiny difference in the issue of overpopulation, and depending on my future decision, possibly only adopt children who are already here.