4, People use too much herbicide to treat weeds. Water in rivers and canals are extremely polluted and has bad effects on people's health( Because)
=> Water in rivers and canals are extremely polluted and has bad effects on people's health bacause people use too much herbicide to treat weeds.

5, Many fish in the river die due to the increased temperature of water (because)
=> Many fish in the river die because the temperature of water was increased

6, Because plastic bags take long to decompose , nearly allgthem still exist is the environment today ( so )
=>plastic bags take long to decompose , so nearly allgthem still exist is the environment today
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