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FILE - In this May 22, 2021, file photo, water drips from a faucet near boat docks sitting on dry land at the Browns Ravine Cove area of drought-stricken Folsom Lake, currently at 37% of its normal capacity, in Folsom, Calif. The sweeping $1 trillion infrastructure bill approved by the Senate this week includes funding for Western water projects that farmers, water providers and environmentalists say are badly needed across the parched region. (AP Photo/Josh Edelson, File)
A lone dead tree stump stands as dust blows along the receding edge of the Great Salt Lake on April 19, 2021, near Antelope Island, Utah. The lake has been shrinking for years, and a drought gripping the American West could make this year the worst yet. (AP Photo/Rick Bowmer)
Cracks fill the bed of the Payagua stream, a tributary of the Paraguay River in Chaco I, Paraguay, early Friday, Aug. 27, 2021. Lack of rain in the Paraguay-Brazil pantanal in the north is threatening to break last year's record when the river dropped to historical levels. (AP Photo/Jorge Saenz)
Rancher Jim Stanko checks the water level of an irrigation ditch, Tuesday, July 13, 2021, on his ranch near Steamboat Springs, Colo. Stanko said that due to drought conditions this year, if he can't harvest enough hay to feed his cattle, he may need to sell off some of his herd. (AP Photo/Brittany Peterson)
Pink water washes over a salt crust on May 4, 2021, along the receding edge of the Great Salt Lake. The lake has been shrinking for years, and a drought gripping the American West could make this year the worst yet. (AP Photo/Rick Bowmer)
FILE - In this Thursday, July 29, 2021 file photo, birds fly over a man taking photos of the exposed riverbed of the Old Parana River, a tributary of the Parana River during a drought in Rosario, Argentina. Parana River Basin and its related aquifers provide potable water to close to 40 million people in South America, and according to environmentalists the falling water levels of the river are due to climate change, diminishing rainfall, deforestation and the advance of agriculture. (AP Photo/Victor Caivano, File)
FILE - In this June 9, 2021, file photo, a small stream runs through the dried, cracked earth of a former wetland near Tulelake, Calif. California regulators on Tuesday, Aug. 3 said some farmers in one of the country's most important agricultural regions will have to stop taking water out of major rivers and streams because of a severe drought that is rapidly depleting the state's reservoirs and killing endangered species of fish. (AP Photo/Nathan Howard, File)
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Wild horses gather around a pond at Simpson Springs on July 14, 2021, near U.S. Army Dugway Proving Ground, Utah. Horses from this herd were later rounded up as federal land managers increased the number of horses removed from the range during an historic drought. They say it's necessary to protect the parched land and the animals themselves, but wild-horse advocates accuse them of using the conditions as an excuse to move out more of the iconic animals to preserve cattle grazing. (AP Photo/Rick Bowmer)
A kayaker paddles in Lake Oroville as water levels remain low due to continuing drought conditions in Oroville, Calif., Sunday, Aug. 22, 2021. (AP Photo/Ethan Swope)
Trash gathers in the heavily polluted Litani Rver, in Saghbin, Bekaa valley, eastern Lebanon, June 20, 2021. Millions of people in Syria and Iraq are at risk of losing access to water, electricity and food amid rising temperatures, record low water levels due to lack of rainfall and drought, international aid groups warned Monday, Aug. 23, 2021. Activists have long warned about pollution levels caused by sewage and waste in the Litani River, Lebanon's longest and a major source for water supply, irrigation and hydroelectricity. (AP Photo/Hassan Ammar)
Biologist Jude Smith looks over a nearly dry spring at the Muleshoe National Wildlife Refuge outside Muleshoe, Texas, on Tuesday, May 18, 2021. The spring is fed by the Ogallala Aquifer, which is becoming depleted because of irrigation and drought. (AP Photo/Mark Rogers)
View of the Furnas hydroelectric dam, on the Rio Grande River in Sao Jose da Barra, Brazil, Wednesday, Sept. 1, 2021. Due the ongoing drought some reservoirs like the Furnas, are reaching critically low levels, impacting water and energy supply in the country's most populous region. (AP Photo/Andre Penner)
A tourist boat navigates through a canyon at the Furnas reservoir near Sao Jose da Barra, Brazil, Thursday, Sept. 2, 2021. Due to the ongoing drought some reservoirs like the Furnas, are reaching critically low levels, impacting water and energy supply in the country's most populous region. (AP Photo/Andre Penner)
Phil Fine pulls a carrot from one of his fields in the North Unit Irrigation District after harvesting the vegetable's seeds on Tuesday, Aug. 31, 2021, near Madras, Ore. Oregon farmers who grow 60% of the world's carrot seed have been without irrigation water for weeks as drought ravages the American West. But just down the road, sprinklers douse crops and cattle graze in green pastures. The stark contrast is a consequence of the West's arcane water law, and it's brought new urgency to efforts to share the resource along Oregon's Deschutes River. (AP Photo/Nathan Howard)
A girl walks on the exposed bed of the Paraguay River, in Villeta, Paraguay, Monday, Sept. 6, 2021, amid an ongoing drought. (AP Photo/Jorge Saenz)
FILE — In this Aug. 22, 2021, file photo a kayaker fishes in Lake Oroville as water levels remain low due to continuing drought conditions in Oroville, Calif. California lawmakers approved billions of dollars in spending aimed at addressing the drought and preventing wildfires in closing the book on the state budget plan, Thursday, Sept. 9, 2021. The Newsom administration noted about $2.7 billion is set aside for seven water storage projects, but voters approved that money seven years ago and so far nothing has been built. (AP Photo/Ethan Swope, File)
People walk on the exposed bed of a branch of the Paraguay river that has gone dry, in Lambare, Paraguay, Tuesday, Sept. 14, 2021, amid an ongoing drought. (AP Photo/Jorge Saenz)
Kate Fitzpatrick, the executive director of the Deschutes River Conservancy, poses for a press photo along the banks of the middle Deschutes River on Tuesday, Aug. 31, 2021, in Bend, Ore. (AP Photo/Nathan Howard)
The dry lake bed of the Wickiup Reservoir is exposed by drought conditions that left the reservoir at 1 percent capacity on Wednesday, Sept. 1, 2021, near La Pine, Ore. As catastrophic drought ravages the West, the irrigation districts with water claims dating back more than a century are first in line for scarce water while others just up the road with more recent claims have already run out. (AP Photo/Nathan Howard)
An irrigation sprinkler waters carrot plants at Smith Rock Ranch in the Central Oregon Irrigation District on Wednesday, Sept. 1, 2021, in Terrebonne, Ore. (AP Photo/Nathan Howard)
The lake bed of the Wickiup Reservoir is exposed by drought conditions that left the reservoir at 1% capacity on Wednesday, Sept. 1, 2021, near La Pine, Ore. (AP Photo/Nathan Howard)
The lake bed of the Wickiup Reservoir is exposed by drought conditions that left the reservoir at 1% capacity on Wednesday, Sept. 1, 2021, near La Pine, Ore. (AP Photo/Nathan Howard)
Phil Fine checks for carrot seeds in the soil left behind in a combine while harvesting a field North Unit Irrigation District on Tuesday, Aug. 31, 2021, near Madras, Ore. (AP Photo/Nathan Howard)
This Aug. 31, 2021 photo shows a bend in the Rio Chama near Abiquiu, New Mexico. Traditional irrigation systems known as acequias that depend on the river are feeling more pressure as drought persists and climate change piles on with warmer temperatures. (AP Photo/Susan Montoya Bryan)
The lake bed of the Wickiup Reservoir is exposed by drought conditions that left the reservoir at 1% capacity on Wednesday, Sept. 1, 2021, near La Pine, Ore. (AP Photo/Nathan Howard)
Sandpipers fly over the exposed bed of the San Francisco stream that reaches the Paraguay river amid a historic drought that is affecting its levels, in Mariano Roque Alonso, Paraguay, Monday, Sept. 20, 2021. (AP Photo/Jorge Saenz)
Boats languish over the last pools of water available on the Payagua stream that reaches the Paraguay river amid a historic drought that is affecting its levels, in Chaco-i, Paraguay, Monday, Sept. 20, 2021. (AP Photo/Jorge Saenz)
A boy covers his face from the dust amid an ongoing drought, in Chaco-i, Paraguay, Monday, Sept. 20, 2021. (AP Photo/Jorge Saenz)
Families fish on the exposed bed of the Paraguay river, amid a historic drought that is affecting the river´s  level, in Mariano Roque Alonso, Paraguay, Monday, Sept. 20, 2021. (AP Photo/Jorge Saenz)

Diminuiscono le riserve d’acqua, i fiumi riducono la portata, i laghi rimangono in secca. Nei grandi parchi naturali americani spariscono le cascate.

La gente ha sete, l’agricoltura è in sofferenza per la siccità e la diminuita disponibilità d’ acqua per l’irrigazione. Aumentano le migrazioni a causa dell’aridità che avanza in tanti Paesi.

Si parla di guerre per l’acqua, di dighe che possono strangolare l’economia di intere nazioni interrompendo il corso dei fiumi (vedi per esempio i contrasti tra i Paesi che si affacciano sul Nilo, o quelli tra le nazioni che sfruttano l’acqua di Tigri ed Eufrate).

Il grande accusato è il cambiamento climatico, ma anche l’incuria e l’egoismo degli uomini hanno una grande responsabilità.

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