"Indeed, as we begin the twenty-first century, the money and traditional economies are slowly destroying their own support system. Increasing demands of the two economies are surpassing the sustainable yields of the ecosystems that underpin them. For example, one-third of the world's cropland is losing topsoil at a rate that is undermining its long-term productivity, fully half of the world's rangeland is overgrazed and deteriorating into desert, and the world's forests have shrunk by about half since the dawn of agriculture and are continuing to shrink."