![]() Animal populations are inhibited by toxic substances, vehicles, and the loss of habitat and food sources.Pollution and physical barriers to root growth promote loss of urban tree cover.Urban development can magnify the risk of environmental hazards such as flash flooding.Large volumes of uncollected waste create multiple health hazards.Automobile exhaust produces elevated lead levels in urban air. By 1990, less than 40 percent of the global population lived in a city, but as of early 2010s, more than half of all people live in an urban area.Concentrated energy use leads to greater air pollution with significant impact on human health.Intensive urban growth can lead to greater poverty, with local governments unable to provide services for all people. ![]() Strong city planning will be essential in managing these and other difficulties as the world's urban areas swell. ![]() 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. But in cities two of the most pressing problems facing the world today also come together: poverty and environmental degradation. Half of the global population already lives in cities, and by 2050 two-thirds of the world's people are expected to live in urban areas. In practice, urbanization refers both to the increase in the percentage of population residing in urban areas and to the associated growth in the number of urban dwellers, in the size of. ![]() The promise of jobs and prosperity, among other factors, pulls people to cities. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |