There are physical limits to growth on a finite planet. In 1972, the Club of Rome issued their groundbreaking report—Limits to Growth (twelve million copies in thirty-seven languages). The authors predicted that by about 2030, our planet would feel a serious squeeze on natural resources, and they were right on target.
In 2009, the Stockholm Resilience Center introduced the concept of planetary boundaries to help the public envision the nature of the challenges posed by limits to growth and physical/biological boundaries. They defined nine boundaries critical to human existence that, if crossed, could generate abrupt or irreversible environmental changes.