For long periods animals in ancient oceans could live only in shallow surface waters, above vast 'dead zones' inhabited only by anoxic bacteria, writes Richard Pancost. Human activity is now creating immense new dead zones, and global warming could be helping as it reduces vertical mixing of waters. Could this be the beginning of something big?
Ancient 'dead seas' offer a stark warning for our own future Richard Pancost University of Bristol | 29th January 2016 Comment Oceans Ecology Geology Pollution plesiosaur-cut.jpg For long periods …