@astor – I think your view of this is perhaps slightly oversimplified. Humankind has certainly become more and more able to avoid nature’s limiting factors. For example, the Poliovirus used to be a devastating disease, but now it barely exists anywhere. However, disease and famine are two limiting factors that will never disappear. As the human population continues to grow, these two issues will probably become much more prominent. This is especially true given the rate at which our species has grown. 40 years ago, the world population was half of what it is now, and is expected to reach almost 10 billion by the year 2050. Humanity and its technology will have to continue to develop by leaps and bounds if overpopulation is not to become a major limiting factor in and of itself. War is also a limiting factor that is only becoming increasingly deadly as technology grows.