I'm wondering if any paleo diet advocates would like to weigh in on the question of human population. To be blunt: how do we decide who lives and dies, and how do we maintain human technological civilization while eating a paleo diet?
The human population of this world is big because of farming. Even before oil and the green revolution the human population was larger than a strictly paleo diet could support. Ceral grains provided the abundant, storage ready calories that allowed the human population to grow.
The world cannot support 7 billion people eating a paleo diet. The world cannot support 7 billion people with pre-industrial agriculture.
Environmentalists, energy analysts, and just about everyone else looking at the problems of the modern world are loath to touch on the central driving factor of most modern problems: the immense and unsustainable human population of this world.