Uzbekistan fears the dam will restrict water supplies to its main cash crop, cotton.
Tobacco farmers know there's not a cash crop they can grow that's as lucrative.
For some 60, 000 families in Peru who survive on growing coca it is a valuable cash crop.
And cotton, the main cash crop, has succumbed over the past decade to disease, credit shortages and cheaper imports.
Besides being a cash crop, it is used as medicine and, as part of tribal culture, smoked on special occasions.
He tried growing pumpkins one year, looking for an alternative, but found tobacco is the best cash crop he can grow.
Over the next two centuries, the growth of tobacco as a cash crop fueled the demand in North America for slave labor.
Because diesel passenger cars are popular in Europe, the mandate is prompting countries like Indonesia and Malaysia to produce biodiesel from their cash crop, palm oil.
Many Afghan farmers are reluctant to switch to a new cash crop because they are accustomed to being paid upfront to grow poppies for opium traders.
The islands' traditional cash crop, cloves, faces a bleak future.
In April, thousands of Peruvian coca farmers marched into the country's capital, Lima, demanding that the government end restrictions on growing the cash crop, which is used to make cocaine.
Until recently, drug addiction in Vietnam was usually associated with ethnic minorities in the highlands, who have been traditional smokers of opium and have long cultivated it as an important cash crop.
But Gov. Jay Inslee insists there are ways to prevent the bulk smuggling of the state's newest cash crop into the black market, including digitally tracking weed to ensure that it goes from where it is grown to the stores where it is sold.
But in a country where over 40% of the population are hill-tribesmen, many of them dependent on opium as a cash-crop and for medicine, it is proving tricky.
The choice crop of landowners looking to cash in on palm oil, the trees grew along the river in thick forests covering thousands of acres.
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