Another bigger problem, raised by VICE reporting, is tundra thawing, leading to ground collapsing 10-30 meters into huge sinkholes. Appearently, one of the possible solutions is replacing tundra forests with grasslands by megafauna and macrofauna grazing, including, potentially, cloned mammoths, because grassland freezes harder in the winter and keeps the permafrost froze during the summer months.