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A warming Earth could mean stronger toxins http://apocadocs.com/s.pl?1289396050
Global warming may be making pesticide residues, heavy metals and household chemicals more dangerous to fish, wildlife and, ultimately, humans, scientists warn.
At the North American branch of the Society of Environmental Toxicology and Chemistry's 31st annual meeting in Portland, Oregon, on 8 November, environmental chemists warned that complex interactions between chemistry and climate change might be making chemicals more toxic and the environment more susceptible to damage.... climate change will cause differences in the movement, quality and distribution of water that could affect stream acidity all over the world. This would alter the toxicity of chemicals such as pharmaceuticals, which make their way into these streams when they are excreted into waster water and flushed down the toilet.
Drugs are designed so that small changes in acidity alter their bioavailability, helping to route them to the bodily tissues where they are needed. But when they reach the environment, says Valenti, "it's the same thing. I've seen upwards of 10- to 20-fold differences in toxicity at pH 9 compared with pH 6".... Goss studied Daphnia magna, a tiny freshwater crustacean used in many aquatic toxicity studies. "We saw greater sensitivity to lead at higher temperatures," she said.
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[Read more stories about:
toxic water, climate impacts, unintended consequences, pharmwater]
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