Environmental News Network: James Zachos fishes around his desk and pulls outa plastic bag filled with chunks of deep-sea sediments. The sediments, wrested from the South Atlantic in 2003, are 55.5 million years old and ‘deep red in color because they are almost entirely clay. Missing is the abundance of shelly residue that gives abyssal sediments their typically pallid complexions. “This is what you end up with when the ocean is being acidified,” the University of California, Santa Cruz, paleo-oceanographer …