Skip to main content

The Growing City of Las Vegas

Credits
USGS; Link: http://earthexplorer.usgs.gov/

In comparing these two images, you get an idea of the rapid growth of Las Vegas, Nevada, between 1973 and 2002. Las Vegas is one of the fastest-growing US cities. Its high immigration rate and its areal extent have a negative effect on the water budget of this arid region. In order to solve this problem, politicians intervened: It is now forbidden to build new swimming pools, fountains must be operated using wastewater and the lawn can only be watered at certain days of the week.

 

Landslides in Brazil

Credits
NASA (Jesse Allen, Robert Simmon); Link: http://earthobservatory.nasa.gov

These images show the hills in the north of Teresópolis, Brazil, on May 24, 2010 and on February 2, 2011. In January 2011, a series of devastating landslides occurred, claiming the lives of 860 people. In the image on the right-hand side, the light brown stripes indicate the mudslides. This natural disaster was caused by the construction of favelas in steep terrain: In order to build the settlements, many trees were cut down whose roots had been ensuring the stability of the ground.