Author: admin
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River metals linked to tar sand extraction
Researchers find that pollutants in Canada’s Athabasca River are not from natural sources. Oil-mining operations in Canada’s main tar sands region are releasing a range of heavy and toxic metals — including mercury, arsenic and lead — into a nearby river and its watershed, according to a new study. Research published online yesterday in the…
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Sewer studies based on leaky science
Questionable sampling techniques have led to murky conclusions about the contents of waste water. Chemicals flushing into sewer systems have been in the news for years. From opiates and hormones to heart medications, studies have detected a range of pollutants. Tests of sewage from hospitals have uncovered antibiotics, and investigations of sewage systems have exposed…
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Arctic Ocean full up with carbon dioxide
Loss of sea ice is unlikely to enable Arctic waters to mop up more carbon dioxide from the air. As climate scientists watched the Arctic’s sea-ice cover shrink year after year, they thought there might be a silver lining: an ice-free Arctic Ocean could soak up large amounts of CO2 from the atmosphere, slowing down…
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Dying trees could exacerbate climate change
Forests could emit more carbon than they store if temperatures rise. Forestry experts have again warned that climate change could transform forests from sinks to sources of carbon. The carbon storing capacity of global forests could be lost entirely if the earth heats up 2.5° Celsius above pre-industrial levels, according to a new report. The…
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Unearthing North America’s First French Colony
In 1541, France established Fort Charlesbourg-Royal in what is now Québec City. Two years later, it was abandoned. The site was discovered in 2005, and archaeologists are trying to understand what took place at the settlement. On a forested outcrop at the western limit of Québec City, Gilles Samson makes his way across an archaeological…