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You have not stated any problem.
they felt like the needed to help the other people
salination of rivers
i am not sure.
salination of rivers
irrigation
There are many geographical problems facing the world today. There are problems with climate such as global warming. There are geographical problems such as threatened habitats that effect the wildlife. Other geographical problems are land degradation, climate change, weather threats such as hurricanes, tornadoes, and tropical storms.
The Sumerians couldn't take the heat so they made a irrigation system. The built canals that connect to the river but the problem was that there crops would get ruined from the floods the irrigation system.
They build a kind of irrigation system
problem creation , problem solution
From wikipedia: "Irrigation" is an artificial application of water to the soil.The problem must be the Aral Sea shrinkage.The Aral Sea lost 90% of its volume within a few decades due to the intense irrigation of cotton and rice fields in Central Asia since 1960s.
you could be taking water from a river with bacteria or oil and chemicals