Earthships and Cob Houses
Earthship: A home built entirely (or primarily) out of renewable/recyclable materials (like sand, mud, certain types of wood and foam, straw, tires, bottles etc.). Often able to sustain habitability with its own food/water/solar power. Cob Houses: Houses made of cob, a mixture of straw and clay. Material is wet enough to be able to form different shapes, but dry enough to build with.
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