The U.S. Navy released a report Wednesday on the USS Fitzgerald and USS John S. McCain collisions from earlier this year.
Some environmentalists were especially worried about the Pacific walrus, but officials say new evidence suggests the species isn't critically at risk.
The news followed a statement from President Donald Trump that more threats would be met with "fire and fury like the world has never seen."
It can take years for corals to recover after just one bleaching event; some reefs around the globe experienced three.
A North Korean official told CNN that the country's nuclear tests would "never stop" if the U.S. continued what the North called "acts of aggression."