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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.
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.
