1.
Reduction of greenhouse effect
2. A
passive heating system does not need and devices or owner to operate it
3. Installation
is possible in low cost too
4. It
does not use up resources
5. In
most cases, the system can be constructed from environmentally clean materials
such as earth, rocks, waste, iron etc
6. They
use energy which is free and available everywhere
7. No
problem of atmospheric pollution
8.
They help to create new agriculture activities.
Really nice and interesting topic this is more important specially for this winter season.
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