Even a casual glance at the headlines reveals a staggering number of places where humans and the Earth are being challenged by overpopulation and/or climate change. People, animals, insects and even plants are migrating because of a warming planet. Competition for limited land, food, water, energy and minerals is causing conflicts across the globe.
We know that human population will be controlled at some point by a combination of war, famine, disease or the difficult political and individual choices that we make. The more we choose to limit our population, and the sooner we mitigate our production of greenhouse gases, the less mass migration, war, famine and disease will play into the equation.