In the middle of winter, when snow is drifting across the frozen landscape, fresh herbs and vegetables are at a premium in the stores. To help you get fresh produce at that time, some companies are advertising counter-top gadgets, so-called “air gardens” to grow your own green sprouts, ready to harvest in the depth of winter. An air garden is a rewarding hobby that can provide some healthy food, such as tomatoes, lettuce and herbs, and aesthetic pleasure as well. Indirectly, it will also contribute some carbon dioxide to the air, but can it be a “polluter”?

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