Why it matters: The moves complete an extreme conservation measure that created a refuge for them on land. It was aimed at ensuring that genetically diverse coral species would survive the bleaching and mortality event.
Halloween trick-or-treaters face the strongest push of cold air so far this season, with forecasters warning of potentially record-low minimum temperatures on Wednesday from the Southern Plains to the Midwest.
The big picture: Some 64.5 million people were under freeze warnings in the U.S., as a "potent cold front" that began sweeping in from Monday was bringing the threat of "freezing to sub-freezing overnight temperatures" from the Southern Plains to the Northeast, per the National Weather Service.
