Webster defines "ethical"
1 : of or relating to ethics <ethical theories>
2 : involving or expressing moral approval or disapproval <ethical judgments>
3 : conforming to accepted standards of conduct <ethical behavior>
My point is that the ethics depend on who defines them. We, as aquarists, define our own "ethics" and those ethics may differ substancially from those that define what is politically correct or not. The vast majority of people would argue that there is nothing wrong with what we do, probably because they enjoy our tanks and with that they could also keep tanks like ours, seeing life that they wouldn't normally see, and finally see that we are keeping our critters alive and for the most part doing it well. How is this any different than keeping any other pet? Animal rights groups define their own code of ethics and, whether or not we agree with them, often influence the rest of the world and cause people to feel guilty for what they do or what society may do. So, whether or not we are "ethical" or not depends on who deems us ethical or not. As an aquarist, I don't care what other people think about my hobby, I'm enjoy it and if that's selfish, then so what? Rather, I care about the critters that I keep and do my best to keep them healthy and alive for a long lifespan.
Next, about global warming...I'm not so sure that this would be as detrimental to reefs worldwide as much as, if it were true, to humans. The way that I see it, and I'm no scientist, but sea levels would rise, temperature changes would occur, existing reefs may or may not adapt, new reefs will form, and some will die. Along the way we'd probably lose some species due to extinction, but then again such a massive change may give rise to new species. Life goes on with or without us. I think that the bigger danger is that we find other ways to destroy reefs, and I believe that pollution (chemical or siltation) are bigger dangers that may cause our reefs to disappear way before major climactic changes could happen.
In summary, before we beat ourselves up, let's consider that we do what we do, and we as a group determine our own ethics, and we don't need others that don't understand our hobby to do so. And we most certainly do determine our own ethics...Examples include not keeping tangs or queen angels in small tanks, discouraging folks from keeping moorish idols, or mandarins in tanks that aren't established, or any critter that has no chance in even the best aquariums.
Finally, how are we any less ethical than the public aquaria? Ours in some cases may be better maintained and a better environment for our critters than they are with theirs?
OK, I'm going to enjoy my tank now and feel good about what I do for my animals.
Nice read everyone, I enjoyed all of the posts.