When new technologies come fourth there isn't always a clear picture regarding what their effects in the future might be. This fact leads to many cases where technologies being used, turn out to be harmful to us and to the environment.
Take asbestos for instance. For years it was used before it was discovered that the substance is highly carcinogenic and detrimental to the environment. Companies don't have the time to do extensive testing over tens of years before they release a product.
It seems that on the one hand new technology brings with it exciting possibilities but on the other hand can be destructive as well.
Hope I helped.