A pileup of ancient logs is trapping millions of tons of carbon in northern Canada — and much of that stored material could be released into the atmosphere due to climate change. The fallen, jumbled-up wood has in some cases been sitting for more than a millennium, protected from decay by the deep freeze and the tight packing of the logs, which are carried northward by the Mackenzie River above the Arctic Circle. And now, amid warming temperatures, the logjam may be at risk of decaying more quickly, said Alicia Sendrowski, a researcher at Michigan Technological University. …The profusion of wood may be storing about 3.4 million tons of carbon, according to Sendrowski’s research work, which was published in the journal Geophysical Research Letters. …She still isn’t sure whether the logjam is losing carbon faster than it is accumulating it through new trees being washed into it. [to access the full story a Washington Post subscription is required]