A local society can become surprisingly independent when it has abundant raw materials, but Greenland had serious limitations.

Some resources could be obtained locally, and Norse households were resourceful, yet a large farming society still needed metal tools and other materials.

Recycling can extend the life of a metal supply, but it cannot create new iron indefinitely.

Every broken blade or nail was therefore part of a larger supply problem when ships became rare.

THE ANIMALS THAT KEPT GREENLAND ALIVE

To understand the Norse disappearance, it helps to think like a Greenland farmer.