Interesting article (in view of prophecy) regarding dropping oxygen levels in our oceans. The article foresees ocean species literally choking to death. I fully believe what scripture tells us about the death of all marine life in the future - but question the article's timeline for this disaster.

http://www.dailymail.co.uk/sciencetech/article-3565431/Are-oceans-running-oxygen-Climate-change-caused-dramatic-reduction-gas-dissolved-seawater-world.html