Midwest, John Dillon, Alexander Cassava discussed on All Things Considered


You're listening to all things considered from npr news remember acid rain in the nineteen seventies and eighties scientists found that rain one hundred times more acidic than normal was harming the mountain force of new england the pollution was linked to fossil fuel plants in the midwest now a new study shows red spruce trees are recovering after decades of damage from the new england news collaborative john dillon has this report on a steep slope in the green mountain of her mont forest researcher alexander cassava does it kind of medical exam on red spruce tree cassava everyone calls her allie uses a long drill like instrument to extract a narrow slice of tree all the way into the core that's sounded makes friction with pushing through because basically cutting wood as it goes through moment of truth this sample backs up with kosiba and her colleagues observed in a recent study of red spruce in five northeastern states after decades of decline the trees are healthy again that looks like the recent growth is quite large and if you go back a decade they start getting a lot smaller and even another decade they're they're really tiny indeed three decades ago the news was much more grim millions of trees like this one were dying their needles read in their growth stunted the reason was acid rain it's caused when pollutants released by fossil fuel plants down wind of new england chemically combined with precipitation and leach calcium out of the soil the calcium depletion.

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