I remember working in a pet shop as a kid, we bred mice and rats in old bathtubs in the basement. Well guess what, there was a magic number, if exceded, nature kicked in and solved the problem. Even the best of food and cleaning did not effect this number, crowding lead to still births, parents killing offspring, infertility and birth defects. I am not saying disregard common sence, but lets use common sence and be realistic. Pollution and global warming are at opposite ends of spectrum. So called greenhouse gases causeing global warming are a myth. Your reef tank is a prime example, even the best reefkeeper has a polluted tank if you want to get picky, compare chemistry, gas exchage and water Quality to the Ocean. Clintrandall what you describe is my sunburst theory, not a slight disrubption on the balance, if we are effecting the envioroment it is so small that it will balance before distruction. I am not saying there is no polution, just that it gets blown out of proportion. Look at your Professors, the ones with the most letters after their names and longest tittles, had to have help tieing thier shoe laces in most cases