an Earthship: a passive-solar home built using discarded materials such as cans and bottles, with dirt-filled tires for its load-bearing walls. Invented by radical New Mexico architect Michael Reynolds, who has been tinkering with them since the 1970s, Earthships are designed to sustain their inhabitants entirely off the grid. The tire walls act like batteries, absorbing the sun’s heat through a bank of south-facing windows during the daytime and then releasing it at night to regulate indoor temperature. Rain and snowmelt drain from the roof into a cistern, providing water that gets filtered
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