Disease-carrying insects move north

As the Earth warms, insects that carry disease are spreading into new areas, bringing the West Nile virus to Canada and malaria to high valleys.

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<p><a href="http://www.physorg.com/news66039803.html">Disease-carrying insects move north</a></p> <p>As the Earth warms, insects that carry disease are spreading into new areas, bringing the West Nile virus to Canada and malaria to high valleys. </p>