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Trying To Spot The Ocean’s 'Plastic Soup' From Up High

Although 3.5 million tons of garbage are floating in the North Pacific, most of it is hard to track down. Could satellites help spot this elusive yet lethal garbage patch?

Plastic soup anyone? (NOAA Marine Debris)
Plastic soup anyone? (NOAA Marine Debris)

Harder than finding a needle in a haystack: spotting "plastic soups' in the ocean?

A French team of researchers from the Ocean Scientific Logistic association (OSL) is setting sails to the Hawaiian Islands –more precisely to the "Seventh Continent," the name given to the huge cluster of plastic waste floating midwater of the North Pacific, over an area six times the size of France. Far from trade routes, nearly 3.5 million tons of plastic are floating there, in the first 30 meters below the water surface.

The goal of this expedition is to collect samples of water and waste to develop a new way of locating layers of plastic debris using satellites. Surprising as it seems, the ocean's garbage patches are hard to locate –and are actually divided in at least five different zones around the globe.

"The ‘Seventh Continent" is not strictly speaking an island we can walk on," says George Grepin, the OSL's biologist. "It's more like a soup made up of billions of plastic pieces the size of a confetti or even invisible to the naked eye. "Under the action of the sun and of currents, bottles, plastic bags and other containers lost at sea end up slowly decomposing to form particles as small as plankton, on which fish feed.

"With our partner, the National Center for Spatial Research (CNES), we hope to check whether, under certain conditions, satellites can spot these debris," says George Grépin.

Satellite lenses are not sharp enough to spot plastic micro-debris. "The best satellites, that is, the Pléiades satellites, are equipped with optical sensors that can take pictures of Earth with a resolution of about 70 centimeters," says CNES's Danielle Staerke. "This is not enough to allow us to see debris that is usually 100 times smaller. Still, if these particles of waste are present in sufficient quantity, they are likely to modify the texture of the water. This effect should be visible on radar images and that's what we are going to check."

The ocean's plastic pollution has a particularly harmful impact on marine life, the most obvious being the risk of animals choking after ingesting floating debris, as well as the accumulation of toxic particles in the food chain.

But this vast "plastic soup" also has more surreptitious effects: the ocean progressively becomes a plastic heaven for a certain species of water striders --the Halobates sericeus-- that usually lay their eggs on rocks… or on floating objects. A study led by Miriam Goldste from San Diego's Scripps Institution of Oceanography shows that the insect has taken advantage of the situation to proliferate. "We don't know exactly what the consequences of this phenomenon are so far," Goldstein says. "But if it gets worse, there will be a risk of endangering the balance of marine ecosystems."

Read more from Le Temps in French. Full story by Caroline Depecker.

Photo – NOAA Marine Debris

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FOCUS: Russia-Ukraine War

War History Shows Why Russia Is Doomed In Southern Ukraine: Supply Lines

Many factors may soon align and force Russia to withdraw troops from Southern Ukraine, independent Russian publication Important Stories argues in an in-depth report on the situation on the ground.

Photograph of Russian soldiers taking part in a military exercise t a training ground of the Russian Central Military District

September 15, 2023: Russian assault units take part in a military exercise

Vazhnye Istorii


A century and a half ago, during the American Civil War of 1861–1865, the foundations of modern warfare were laid out, marking the transition to large-scale, industrial-era armies.

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Innovations like the telegraph played a pivotal role, enabling coordinated operations across vast distances and swift responses to changing battle scenarios. The advent of breech-loading firearms and rifled artillery disrupted traditional infantry formations, driving soldiers into trenches for protection.

Meanwhile, the introduction of all-metal warships and the first use of submarines in combat hinted at the future of naval warfare. Balloons were employed for battlefield observation and reconnaissance, foreshadowing the era of aerial warfare.

Over the next five decades, automatic weapons, tanks, and aircraft further transformed the landscape of warfare. However, the most revolutionary and foundational innovation was the utilization of railways for the transportation and supply of troops. In 1862, the US Military Railroad Agency pioneered this concept, marking a historic milestone in military history.

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