Can anything save coral reefs from global bleaching?

Coral reefs from Australia to North America are experiencing their fourth global bleaching event in the past 30 years. That's according to the US National Oceanic and Atmospheric Administration's (NOAA) Coral Reef Watch. Scientists worry that the coral reefs won't be able to survive continued rising sea temperatures. Host Carolyn Beeler speaks with reef expert David Obura, founding director of CORDIO East Africa.