Islamic Achievements in Medieval Medicine: Hospitals and Doctor Training. Rather than viewing disease as a punishment from God as the Christians thought, Islam looked at disease as just another problem for mankind to solve. The Prophet decreed that the sick and injured should be cared for, not shunned.
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Poor air and water quality, insufficient water availability, waste-disposal problems, and high energy consumption are exacerbated by the increasing population density and demands of urban environments. Strong city planning will be essential in managing these and other difficulties as the world's urban areas swell.