Originally Posted by 1fluffhead

actually they do depending on the synthetic material used. Plastic for example, can be made from natural gas, crude oil or natural cellulose all of which will have to either directly or indirectly effect an ecosystem during the procurement process.
http://www.export911.com/ref/oriPlast.htm

Unless your saddle is made from the skin of a pesticide free fruit that has fallen to the ground after it reach maturity, it will impact some ecosystem on some level. Even in this example, you are effecting the ecosystem by removing potential food source for some animal.

Everything has an impact on an ecosystem.

BTW I can’t believe that this thread is still here and now I am adding more to it.