A shark only just formally discovered might already be extinct - a fate no shark has yet suffered in the human era - while an Amazon river dolphin has become endangered, a Red List of species in trouble showed on Thursday.
Slimy, stinky brown seaweed that ruins beachgoers' vacations from Mexico to Florida may be the new normal unless Brazil halts Amazon deforestation, experts say. The culprit, called sargassum, turns clear-blue seawater a murky brown and smells like rotten eggs when it washes ashore and starts to rot.