We know that many of our natural fibres like cotton or jute requires the growth of crops. For this we have to cut a large number of natural vegetation comprising of various types of plants. This reckless cutting down of trees may and have endangered many species.
So synthetic fibres made from chemicals may reduce deforestation.
All the natural fibres like jute, cotton,etc need deforestation. As the production of synthetic fibres decreased the production of natural fibres it helps in reducing deforestation. As it can reduce deforestation its useful in conservation of forests. Hope this helps you