22 Aug 2011:
Growth of Urban Areas
Poses Long-Term Threats, Study Says
A new study says the explosive growth of urban areas worldwide over the next two decades poses significant risks to human populations and the global environment
, from the loss of agricultural land and wildlife habitat to increased vulnerability to the effects of climate change. Using satellite data on urban growth, the study calculates that the world’s total urban area quadrupled in size from 1970 to 2000 — an increase of about 22,400 square miles. By 2030, that urban footprint will expand by another 590,000 square miles to accommodate the more than 1.47 billion additional people expected to be living in the world’s cities, according to the study, conducted by researchers from four U.S universities — Yale, Arizona State, Texas A&M, and Stanford. “[Cities are] going to be growing and expanding into forests, biological hotspots, savannas, coastlines — sensitive and vulnerable places,” said Karen Seto, an associate professor of urban development at the Yale School of Forestry & Environmental Studies and lead author of the study, published in the online journal PLoS ONE
. According to the study, urban areas have been developing most rapidly along coasts, where people and infrastructure are vulnerable to flooding, tsunamis, and other natural disasters.
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Tribal people and ranchers join together to stop a project that would haul coal across their Montana land. Watch the video.
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An aerial view of why Europe’s per capita carbon emissions are less than 50 percent of those in the U.S. View the photos.
Ugandan scientists monitor the impact of climate change on one of Africa’s most diverse forests and its extraordinary wildlife. Learn more.
video series looks at the staggering amount of food wasted in the U.S. – a problem with major human and environmental costs. Watch the video.
video goes onto the front lines with Colorado firefighters confronting deadly blazes fueled by a hotter, drier climate. Watch the video.
A three-part series Tainted Harvest
looks at the soil pollution crisis in China, the threat it poses to the food supply, and the complexity of any cleanup. Read the series.