On Alaska's northern coast, they met Native Alaskans dealing with melting permafrost and coastal erosion.
In regions influenced by permafrost , water migrates along the thermal gradient from warm to cold, thereby feeding ice in the frozen core.
These self-organized patterns result from the effects of freezing and thawing on layers of stone and soil overlying permafrost .
The rest of the year what little soil there is on the surface is rock hard above permafrost .
The forest grows atop permafrost , a layer of soil that remains frozen year-round.
Hot, dry summers have thawed permafrost layers and shriveled berry crops.
Most of the remainder comes from wetlands, gas hydrates, permafrost , and termites.
hilly terrain underlain by permafrost
We are already beginning to see the likely effects of climate change: melting permafrost and the retreat of permanent icepacks.
Increased snow and ice melt have caused higher rivers while thawing permafrost has wreaked havoc with roads and other infrastructure.