"The earth can still feed a few more billions of people and there is still sufficient space."
Globally the food situation is very tense. There are hardly any stocks. Wheat reserves, for instance, are barely sufficient for a couple of months. Many millions of people suffer hunger. In order to help those people we don't have to grow. We must use our work and resources differently.
There is certainly not "sufficient space". On the contrary. Many people live in cramped conditions in mega cities and miserable slums, soon (2008?) more than half of humanity.
Population growth is unabated, approximatelely 75 Million a year. They all need shelter, food, clothes, heating and some decent work. All that requires additional resources, most of which are non-renewable.
We are now, 2007, at 6,5 Billion people. Some estimate say that the earth could only carry some one billion people sustainably.
World population was estimated at
The world population is still rising:
as we wrote this page.