Environmental problem?

I was cleaning my saltwater tank and doing a water change today and got to thinking. Are saltwater fishkeepers increasing the salinity of the world's oceans when we do water changes? After all the salt is synthetic, so it didn't come from the ocean, but that where it will end up. Any thoughts?Environmental problem?Good question, and makes sense. How about this one to ponder...all the medications ie: antibiotics, malachite green and formaldahyde(sp), that we add to our tanks, do water changes, and dump that water down the sink-right into our sewers and water supplies. They've already proven they've found Prozac and meth in the water systems...Environmental problem?Depending on your sewage system it may get refiltered somehow. If our sewage and water comes from a river and I changed my salt water tank then wouldn't the fish die in the rivers?Environmental problem?The effects of this would be minimal and take a very long time to cause any noticeable effects. I doubt humans will be here long enough to see any of these effects.