MSNBC MSNBC Live with Kendis Gibson September 22, 2019 18:54:00
F we went diving to see the devastation first-hand. >> how sad are you when you see what the coral looks like today versus 30 years ago? >> reporter: side by side views charted over the last three decades best show the decline. this looks beautiful to me. what did it used to look like? >> it used to be covered with coral right up to the surface. these are beautiful brown branching corals. over 95% of that coral is gone. why is this happening? for years scientists thought it was warming ocean waters believed that weakened corals and made them susceptible to deadly diseases. >> the temperature l...