Ancient Ice Age Grasslands Could Cool Arctic

In northeastern Siberia, researchers at Pleistocene Park are conducting an experiment to combat climate change by reintroducing large grazing animals. The park aims to restore the ancient "mammoth steppe" ecosystem, a vast grassland that once covered much of northern Eurasia.

The core hypothesis is that these herbivores can help keep Arctic permafrost from thawing. During winter, their trampling of snow would allow colder temperatures to penetrate the ground, while summer grazing would promote grasses over insulating moss and shrubs.

Founded in 1996 by Sergey Zimov, the park now hosts species like Yakutian horses and European bison. While mammoths are not present, the goal is to recreate a highly productive steppe. Permafrost holds vast amounts of carbon, and its thaw accelerates climate change by releasing greenhouse gases.

Early results from field experiments suggest that increased grazing density can lower permafrost temperatures locally. However, many scientists caution that the animal densities required for a significant global impact are extremely high and may not be naturally sustainable.

While acknowledging the potential of ecological restoration, experts emphasize that reducing fossil fuel emissions remains paramount. Pleistocene Park continues as an ongoing scientific experiment, with researchers monitoring its effects on vegetation, snow cover, and soil temperatures.

This project has gained attention as Arctic warming accelerates, nearly four times faster than the global average since 1979. The ultimate success of Pleistocene Park in slowing permafrost thaw on a large scale remains an open scientific question.