Plankton, crucial to the planet for food and oxygen, in deep trouble; global warming blamed

Key base of ocean food web dropping dramatically

WASHINGTON — New research shows that levels of plankton in the world’s oceans are declining sharply.

Scientists say that’s got them concerned because much of life of Earth depends on these tiny ocean plants. They are the base of the ocean food web. And they make half the world’s oxygen and suck up harmful carbon dioxide.

A study published Wednesday in the journal Nature shows plant plankton levels are down 40 percent since the 1950s. Researchers are blaming global warming. They say warmer surface water makes it hard for plant plankton to get vital nutrients.

Online:

Nature: www.nature.com/nature