How is cotton farming harmful to the soil what was done to keep the earth usable?

The cotton farming is harmful to the soil because it is very easily infested by worms, and to keep the crops safe and healthy a big amount of pesticides are used. The big amount of pesticides are washed away with the water into the soil, the soil gets contaminated, and also the underground waters, and a big damage is done to the surrounding environment as well. Since it requires a lot of water for irrigation, also salinisation of the soil occurs, thus the soil is degrading. For this process to stop, in recent times the cotton farming has been directed in the way of the organic production, where there's no usage of toxic chemicals, but organic ones.