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Columbia Glacier, Alaska, USA
Since 1980, the terminus of Columbia Glacier has retreated 20 kilometers, making it one of the most rapidly changing glaciers in the world. A 300-meter deep fjord now replaces the portion of the valley once occupied by the glacier.
Huang He Delta, China
China’s second longest river, the sediment-choked Huang He (Yellow River), is one of the muddiest rivers on earth. The sediments it carries are deposited at the river’s mouth, creating an ever-changing delta.
Las Vegas, Nevada, USA
Between 1972 and 2020, the population of Las Vegas grew from 273,000 to over 2.2 million. Spurred by expansion of the gaming and tourism industries, Las Vegas is one of the fastest growing metropolitan areas in the United States. The urban growth is steadily infringing on the arid ecosystems surrounding the city.
Toshka Project, Egypt
Egypt’s Toshka Project diverted water from the Nile River to the Sahara Desert. The project’s lofty goal was to cultivate a half million acres of land and create a “second Nile Valley.” The Toshka lakes formed in 1998 and reached a peak in size in 2001. Then they promptly began shrinking. But at the end of 2019, they filled up again.
Wadi As-Sirhan Basin, Saudi Arabia
These two images reveal the effects of center-pivot irrigation systems in Saudi Arabia’s desert region known as Wadi As-Sirhan. This landscape has been transformed from wasteland into cropland covered with circular green fields. The fields are watered with groundwater, which in this arid region is a nonrenewable resource.
Yellowstone National Park, USA
Dry conditions, along with dry cold fronts that brought lightning but no rain, created extreme fire danger in the summer of 1988. These images show old forest as dark green, occasionally broken up by lighter green grassy meadows or plains. Land just burned is dark red. More than 793,000 acres, or 36% of the park, burned that summer.