Rope has traditionally been made from existing natural plant fibres, braided together in every conceivable combination to give it natural strength and durability. Rope manufactured today continues to be made from natural fibers as well as synthetic fibers such as polyester, nylon, and rayon. The use of synthetic fibers increase the preservation of the fibers against the natural attrition of the elements. The use of the rop would tend to dictate the selection of rope fiber bing used.
No outstanding environmental concerns have turned up over the process of rope making and it's current practice today. As is the case with all things, if one searches hard enough, a small segment of unrest over manufacture issues could probably be found, but it would hardly be enough to signify a united global concern.