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Sustainability
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A thick stone wall can act as a ........ and release warmth slowly.
heat sink
They decided to ....... old wood to make furniture for the new house.
repurpose
Concrete floors have great ....... mass and help keep the house warm at night.
thermal
The ...... wall in the living room looks beautiful and also helps control heat.
bottle
This house is completely ........ and uses no public utilities.
off the grid
The ............... collects water from the roof when it rains.
rainwater harvesting system
We installed .......... on the ceiling to let in more natural light during the day.
skylights
Our home is partly underground—it's an ........... house.
earth-bermed
The builders used ....... tires to create strong, eco-friendly walls.
scrap
A ............. on the roof provides electricity from sunlight.
photovoltaic panel
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