Just got back from Belize last week.  Every time I dive what I see amazes the heck out of me.  I'm sure we negatively affect the reefs and their systems in many, many ways.  What baffles me is the push back on advancing technologies to reduce our impact on the planet.  The talk of how it costs jobs is a bunch of hand-waving garbage.  It also increases jobs in areas of research and development of these new technologies.  If anything, the challenges those technologies present do more for us than against us.