Presents a series of comparative images from NASA clearly shows the extent to which the environment under the influence of natural processes and anthropogenic activities.
The Aral sea in Central Asia was once the fourth largest lake in the world. Drought conditions and diversion of water for irrigation led to a rapid decrease in its level, which in turn led to the decline of the local population. In 2014, the Eastern basin has completely dried up.
Snow California mountain system of the Sierra Nevada (“snowy mountains” in Spanish) reached a year ago, the lowest level in the history of mankind. California reservoirs are heavily dependent on annual snowmelt. After several years of drought, the government first decided to limit water consumption. In 2015, the number of snow reserves accounted for only 5 % of normal. In 2016 the situation has improved, but standards of the amount of snow is not reached.
Lake Mead, fed by meltwater from the Rocky mountains, is the largest reservoir in the United States. In recent years, due to drought and increasing demand for water height of the lake has decreased by 41 meters that threatened the valley of Las Vegas, as the water supply in the region depends 90% on its inventory.
The Lyell glacier in Yosemite national Park California over the last century has decreased significantly, revealing layers hidden beneath the bedrock. Glaciers are very sensitive to processes in the environment and therefore represent one of the most important indicators of climate change.
A depleted lake
The reduction of the snow cover in the Rocky mountains led to the decrease in the volume of water in lake Powell, located in Utah and Arizona (USA), causing problems for communities that depend on its resources.
Grandense glacier Zachariae Isstrøm since 2012, is retreating faster every year, dropping into the North Atlantic tons of ice. Experts fear that such a rapid melting will have a huge impact on sea level rise.