From The Guardian of London comes this article about the problems caused by invasive species, the difficulty in predicting the next "big thing", and issues regarding what is native and what was introduced a really long time ago. A nice piece covering a lot of ground, focusing mainly on America though it's in a British paper. The author does gloss over the bit about why species are invasive, attributing it to the absence of predators; there are many other reasons a species might be invasive when introduced to a new habitat, and this is only one of them.
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