The territorial body has been polluted by roads, elevators, etc. Similarly, our animal body starts being polluted. Ecology no longer deals with water, flora, wildlife and air only. It deals with the body itself as well. It is comparable with an invasion: technology is invading our body because of miniaturisation.
Abortion raises moral and spiritual questions over which honorable persons can disagree sincerely and profoundly. But those disagreements did not then and do not now relieve us of our duty to apply the Constitution faithfully.