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What sorts of species become 'invasive aliens' in a world of climatic change? Illustrate your answer with examples from both the plant and animal kingdoms. "Invasive alien species have caused untold damage to natural ecosystems and human economies alike over the past few centuries. Globalization is accelerating the destruction, as expanding tourism and trade offer more and more opportunities for unwanted species to hitchhike to new homes." - Mr. H. Zedan, Executive Secretary of the CBD, 6th meeting of COP of CBD, 2002 "The concept of 'alien' can be seen as irrational if we look back at the history of vegetation dispersal, survival and evolution and a time reference point is needed if we are to justify what is native and what is alien." - Trudgill, 2001: 681 There is a long history of concern about the impact of non-native species upon 'natural' environments, as illustrated by the 1905 publication date...

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