Overpopulation is a very real threat. We are devastating our environment by our sheer numbers and I believe that it would be wise to be prudent in our reproducing.
It seems to me that voluntary abortions now could save future generations from possible forced abortions. (Think China)! Or no future at all (think dinosaurs)!
Please check out this link http://www.overpopulation.org and please be sure to click on environmental impact in the left hand margin. If you are honestly pro-life, and would like to see the survival of the human race, you might choose to reconsider your position on abortion.