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, according to most forecasts, until at least the year 2100 ( O'Neill and Balk, 2001 ). At the same time, widespread urbanization has the effect of concentrating the growing population into dense settlements at unprecedented rates ( Meyer and Turner, 1992 ). Near-term (<50 yr) population growth is expected to occur primarily in moderate-sized urban areas of developing countries maintaining high birth rates ( United Nations, 2001 ). This represents a relatively recent change of physical habitat for humans
, according to most forecasts, until at least the year 2100 ( O'Neill and Balk, 2001 ). At the same time, widespread urbanization has the effect of concentrating the growing population into dense settlements at unprecedented rates ( Meyer and Turner, 1992 ). Near-term (<50 yr) population growth is expected to occur primarily in moderate-sized urban areas of developing countries maintaining high birth rates ( United Nations, 2001 ). This represents a relatively recent change of physical habitat for humans
