Environmental and economic changes could make it easier for non-native plants and animals to gain a foothold in the North.
Interior Alaskas hot and dry summer of 2013, coupled with an invasion of insect pests, has taken a steep toll on the regions birch trees, experts say.
Elodea, a fast-growing leafy plant, is now in a roadside ditch at the marsh, and a response plan is in the works.
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