While I appreciate Emilie Marlinghaus's excellent letter in defense of Planned Parenthood, unfortunately she is mistaken when she says, "we are rapidly exceeding Earth's carrying capacity." Reputable scientists have suggested that earth's carrying capacity for humans that will allow all the other animals and plants a healthy existence, instead of going extinct, is about 2 billion. We therefore already have over three times as many humans on this planet as this planet can sustain. We can see this in the depletion of our resources such as oil, the emptying of the ocean's fisheries, the disappearance of our forests, the desertification of our croplands, and of course global warming.
Humans have never faced such a challenge before, although the depletion of resources has preceded the fall of many past "civilizations." At the rate we are going, we appear to be too stupid to save ourselves.
Best regards, - Donangelo