Posted: May 15, 2017 at 3:29 am Dramatic drops in oceanic oxygen, known as “anoxia”, which cause mass extinctions of sea life, come to a natural end – but it takes about a million years. Scientists believe the modern ocean is “on the edge of anoxia” and say it is “critical” to limit carbon emissions to prevent this. submitted by /u/drewiepoodle to r/science [link] [comments] Source: Reddit: TGIOKDI Upvoted Leave a Reply Cancel replyYou must be logged in to post a comment.