Engineer Benjamin Morales Arnao, local glaciologist, has tested a method to reverse the thaw; cover the ice with a layer of sawdust 15 cm thick. The experiment was carried out on Mount
Chaupijanca and Pastoruri. The first glacier managed to keep four meters of ice and the second kept five meters. "This material acts as an insulator. It contains cellulose and thus we managed to decrease the melting glacier. Although this method has worked well, we'll be testing other alternatives", said Morales. "Those experiments curb glacial retreat on a small scale, but cannot bring ice blocks like Pastoruri back from the brink," said Selwyn Valverde with the
Huascaran National Park, home to Pastoruri and more than 700 other shrinking Peruvian glaciers. "It's irreversible at this point," he said, adding that Pastoruri is no longer technically a glacier because it does not build up ice in the winter to release in the summer. "It's just loss, loss, loss now. It doesn't accumulate anymore." ==References==