The other carbon problem.

CO2 from air travel also contributes to ocean acidification. See the Acid Test video by the Natural Resources Defences Council and narrated by Sigourney Weaver.

"So, You can just worry about the big things in the ocean, you have to worry about what they eat. And where their food comes from. If the small things in the ocean are affected  by ocean acidification, then it ripples all the way up the food web. Making the largest things in the ocean even more endangered." Steve Palumbi, Ph. D. Stanford University.

Also

Watch the Royal Society presentation by Charlie Veron: Is the Great Barrier Reef on Death Row?