Environmental scientists are sounding the alarm after the world's coral is set to reach a particularly grim milestone.

Ecologists say that, as the world's oceans warm, the overall percentage of reefs experiencing heat stress could put us in the world's fourth ever global bleaching event, the second in just the last decade.

For more on this, we're joined on the KCBS Ring Central Newsline by Howard Lasker, Professor of Environment and Sustainability at the University of Buffalo, he's an expert on coral reefs.