Unsustainable development compromises the ability of future generations to meet their needs. Phenomena including global warming, destruction of the ozone shield, acidification of land and water, desertification and soil loss, deforestation and forest decline, diminishing productivity of land and waters, and extinction of species and populations, demonstrate that human demand is exceeding environmental support capacities. Population growth increases poverty and deprived people are forced to undermine the productivity of the land on which they live. It is extremely difficult for people, or other species, to adjust to change at this rate.