Edited sentence: , to date, increases in efficiency of production and consumption have not been sufficient, when applied to existing trends in population and resource depletion and waste by-production, to allow for projections of future sustainability.According to them, on a planet where 20% of the population consumes 80% of the natural resources, a sustainable development cannot be possible for this 20%: "According to the origin of the concept of sustainable development, a development which meets the needs of the present without compromising the ability of future generations to meet their own needs, the right term for the developed countries should be a sustainable de-growth".For several decades, theorists of steady state economy and ecological economy have been positing that reduction in population growth or even negative population growth is required for the human community not to destroy its planetary support systems, i.The proponents of the de-growth reckon that the term of sustainable development is an oxymoron