Lake Meredith, Texas: Landsat satellite photograph showing Lake Meredith in 1990, left and 2011, right. Lake Meredith is an artificial lake formed by the Sanford Dam in Texas. The 2011 image clearly shows how much water loss through continual drought has occured since 1990
The Aral Sea in Uzbekistan and Kazakhstan: These Landsat satellite photographs are of the Aral Sea, found between Uzbekistan (west) and Kazakhstan (east). It used to be the fourth largest lake in the world This inland lake is. Since the 1960s it has lost more than half of its volume and these images show how its size has decreased in the last 40 years.
The first image, on the top left was taken in 1973 and then from left to right on the top row: 1987, 1999 and 2001. The bottom row shows photos from 2004, 2007 and 2009. The shrinkage is due to overuse of feeder rivers (the Syr Darya and Amu Darya) for the irrigation of cotton and paddy fields
Deforestation in Bolivia: Landsat satellite photographs showing deforestation in the Santa Cruz de la Sierra region of Bolivia. The forest (red) is being encroached upon by growing settlements, which house people resettled from the Altiplano (high Andean plains). Each settlement is surrounded by fields, which mostly grow soybeans for export.
There are concerns that large-scale deforestation may contribute to global warming and the greenhouse effect by removing trees, which absorb carbon dioxide.
Landsat satellite photograph of Columbia Glacier in 1986 (top), 2000 (middle) and 2011 (bottom). The Columbia Glacier descends from an ice field 3,050 metres above sea level, down the flanks of the Chugach Mountains, and into a narrow inlet that leads into Prince William Sound in southeastern Alaska. It is one of the most rapidly changing glaciers in the world. Snow and ice appears bright cyan, vegetation is green, clouds are white or light orange, and the open ocean is dark blue. Exposed bedrock is brown, while rocky debris on the glacier's surface is gray.
Between 1980 and present day the glacier (shown as the wispy medium blue) has retreated 20 kilometres north and lost roughly half its thickness and volume.
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