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Likewise, continued population growth occurs in the context of an accelerating demand for water: Global water consumption rose sixfold between 19, more than double the rate of population growth.
At highly advanced development stages, environmental pressures may subside because of improved technologies and energy efficiency.
Within countries and across households, however, the relationship between income and environmental pressure is different.
No simple relationship exists between population size and environmental change.
However, as global population continues to grow, limits on such global resources as arable land, potable water, forests, and fisheries have come into sharper focus.
In Hunter concludes that population dynamics have important environmental implications but that the sheer size of population represents only one important variable in this complex relationship.
Other demographic dynamics, including changes in population flows and densities, can also pose challenging environmental problems.
The distribution of people around the globe has three main implications for the environment.
First, as less-developed regions cope with a growing share of population, pressures intensify on already dwindling resources within these areas.
Continued high fertility in many developing regions, coupled with low fertility in more-developed regions, means that 80 percent of the global population now lives in less-developed nations.
Furthermore, human migration is at an all-time high: the net flow of international migrants is approximately 2 million to 4 million per year and, in 1996, 125 million people lived outside their country of birth.