WASHINGTON — A panel of experts says the world’s oceans are being damaged in so many ways that the situation is far more dire than they originally thought.

Scientists will present a new report on the oceans to the United Nations on Tuesday. They say the troubles are from global warming and other man-made problems. Those include dead zones from farm run-off, overfishing, an increase in acidity from too much carbon dioxide, habitat destruction and melting sea ice.

The report is from the International Programme on the State of the Ocean. The combination of damaging effects on the seas suggest there’s a brewing worldwide die-off of species that would rival past mass extinctions.