Many efforts are being made to harness solar energy by converting it into hot water or electric power. And yet the easiest way to harness solar energy is the most obvious and the oldest: namely, to trap the heat inside a greenhouse and use it for growing flowers and vegetables.

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Light on Two Sides --> HERE HERE HERE --> Fruit Trees HERE --> Good Materials

In temperate climates, build a greenhouse as part of your house or office, so that it is both a "room" of the house which can be reached directly without going outdoors and a part of the garden which can be reached directly from the garden.