Arctic sea ice has been rapidly declining since satellites first started tracking it in 1979, and according to NASA, roughly 13.3 percent of the ice disappears every decade. Models have projected that manmade global warming would heat the Arctic faster than it would heat more temperate regions, and observation has borne that out. The Arctic is warming at least twice as fast as the rest of the globe, and the first two months of this year both had the lowest levels of sea ice on historical record.
Condition of Oceans
cientists say that the equivalent of a dump truck load of plastic is deposited in the world’s oceans every minute, and this quantity will only increase as consumption and population grow, too. By 2050, it’s said there will be more plastic than fish in the seas. The UN writes, “As many as 51 trillion microplastic particles – 500 times more than stars in our galaxy – litter our seas, seriously threatening marine wildlife.”
The amphipods were contaminated with PCBs — polychlorinated biphenyls — toxic chemicals used for decades in industry, as well as other industrial pollutants known as persistent organic pollutants.
“Every sample we had,” Jamieson says, “had contaminants in it at very high or extraordinarily high levels.”
Farther south, the Bering Sea has emerged as a hot spot for warming-water studies — almost literally. Sea-surface temperatures in the Bering reached 14 degrees Celsius last summer (57 degrees Fahrenheit) and were generally 3 degrees Celsius (5 degrees Fahrenheit) warmer than normal, scientists reported.
The oceans have absorbed a third of all the carbon dioxide emitted since the Industrial Revolution and have helped deflect extreme warming. But recent research has shown that climate change has made seawater acidity rise faster than at any time in the last 55 million years, with unpredictable and potentially disastrous consequences for life. What can we do?