A greenhouse is a structure with a glass or plastic roof and frequently glass or plastic walls; it heats up because incoming visible solar radiation from the sun is absorbed by plants, soil, and other things inside the building. Glass is transparent to this radiation. The warmed structures and plants inside the greenhouse re-radiate this energy in the infra-red, to which glass is opaque, and that energy is trapped inside the glasshouse.
Here's a quick video on how to build a greenhouse, low cost and under budget by http://www.cheapgreenhouses.net
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