Environmental Glance
Lower levels of oxygen in the Earth's oceans, particularly off the United States' Pacific Northwest coast, could be another sign of fundamental changes linked to global climate change, scientists say. They warn that the oceans' complex undersea ecosystems and fragile food chains could be disrupted.
In some spots off Washington state and Oregon, the almost complete absence of oxygen has left piles of Dungeness crab carcasses littering the ocean floor, killed off 25-year-old sea stars, crippled colonies of sea anemones and produced mats of potentially noxious bacteria that thrive in such conditions.
Growing low-oxygen zones in oceans worry scientists
Humans must be to blame for climate change, say scientists
Climate scientists have delivered a powerful riposte to their sceptical critics with a study that strengthens the case for saying global warming
is largely the result of man-made emissions of greenhouse gases.
The researchers found that no other possible natural phenomenon, such as volcanic eruptions or variations in the activity of the Sun, could explain the significant warming of the planet over the past half century as recorded on every continent including Antarctica.
Methane bubbles in Arctic seas stir warming fears
Large amounts of a powerful greenhouse gas are bubbling up from a long-frozen seabed north of Siberia, raising fears of far bigger leaks that could stoke global warming, scientists said.It was unclear, however, if the Arctic emissions of methane gas were new or had been going on unnoticed for centuries -- since before the Industrial Revolution of the 18th century led to wide use of fossil fuels that are blamed for climate change.
The study said about 8 million tonnes of methane a year, equivalent to the annual total previously estimated from all of the world's oceans, were seeping from vast stores long trapped under permafrost below the seabed north of Russia.
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U.S. backs efforts to ban international trade of Atlantic bluefin tuna
The U.S. government announced Wednesday that it supports prohibiting international trade of Atlantic bluefin tuna, a move that could lead to the most sweeping trade restrictions ever imposed on the highly prized fish.
Sushi aficionados in Japan and elsewhere have consumed bluefin for decades, causing the fish's population to plummet. In less than two weeks, representatives from 175 countries will convene in Doha, Qatar, to determine whether to restrict the trade of bluefin tuna -- valued for its rich, buttery taste -- and an array of other imperiled species under the Convention on International Trade in Endangered Species (CITES).
Herbicide Chemical in Drinking Water Could Pose Much Greater Danger to Health Than Previously Thought
Contamination of drinking water by a common herbicide poses a greater health threat than previously believed, according to a report issued by the nonprofit environmental organization Natural Resources Defense Council (NRDC).
Rulings Restrict Clean Water Act, Foiling E.P.A.
Thousands of the nation’s largest water polluters are outside the Clean Water Act’s reach because the Supreme Court has left uncertain which waterways are protected by that law, according to interviews with regulators. As a result, some businesses are declaring that the law no longer applies to them. And pollution rates are rising.
Companies that have spilled oil, carcinogens and dangerous bacteria into lakes, rivers and other waters are not being prosecuted, according to Environmental Protection Agency regulators working on those cases, who estimate that more than 1,500 major pollution investigations have been discontinued or shelved in the last four years.
Large Iceberg Breaks Off Antarctica's Mertz Glacier
A joint Australian-French study has discovered the calving of a large iceberg from the Mertz Glacier in the Australian Antarctic Territory. The iceberg -- 78 kilometres long with a surface area of roughly 2,500 square kilometres, about the size of Luxembourg -- broke off the Mertz Glacier after being rammed by another iceberg, 97 kilometres long.
The Mertz Glacier had a large crack in it for two decades. A second crack developed opposite the first in the early part of the 21st century. The collaboration studied whether these two cracks would eventually meet, and the processes that would lead to the calving of an iceberg.
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