A staggeringly terrible ecological disaster is on the way, researchers are warning: Invasive insects set to kill somewhere in the region of 1.4 million trees across the United States in the next three decades.
, predicted to be responsible for 90 percent of those 1.4 million dead trees. The beetle could wipe out ash trees in more than 6,000 urban areas,The cost of replacing the trees and the associated damage could run up to US$30 million a year on average. If more invasive species were able to settle in the US, that figure could quickly get into the billions of dollars before 2050.
"These results can hopefully provide a cautionary tale against planting a single species of tree throughout entire cities, as has been done with ash trees in North America,"The sobering estimations were made using data collected from around 30,000 urban areas in the US. Models of tree populations were then combined with predictions for the spread of 57 different invasive species.
Hotspots – including New York, Chicago, and Milwaukee – were identified in the report because of their high numbers of ash trees and because they're in the recent or near-future path of the emerald ash borer. Less than a quarter of US communities will take 95 percent of the invasive species hit on trees,Part of the problem is the lack of variety in terms of tree species in urban areas, as the concentrations of ash trees shows.
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