The dairy farms and Scandinavian culture the Norse established in settlements in Greenland lasted for about 450 years, a very good track record. However, what happened to the Gardar dairy farm shows that, rather than adapt to the ecological conditions of Greenland, the Norse were determined to keep using Scandinavian farming techniques in their new environment. They were able to do this successfully until they wore out the land with overgrazing, the climate began to cool, and Viking ships stopped arriving to shore them up with supplies.
Unlike the Inuits, who were able to adapt to their environment and learn to survive through fishing in waterproof kayaks, the Norse refused to adapt. They could have learned from the Inuit, but they were determined to impose their own cultural norms about how life should be lived on the environment. That did not work, so the Norse disappeared. As Diamond states,
The Norse were undone by the same social glue that had enabled them to master Greenland’s difficulties.... The values to which people cling most stubbornly under inappropriate conditions are those values that were previously the source of their greatest triumphs over adversity.
In contrast, Diamond says, the Huls dairy farm in Montana is thriving:
Huls Farm, a family enterprise owned by five siblings and their spouses in the Bitterroot Valley of the western U.S. state of Montana, is currently prospering.
The lesson Diamond draws it that though thriving now, the Huls should take heed of what happened to the Gardar farm and be willing to adapt to the local ecology.