The echinacea sold in drugstores comes in a wide range of liquids, pills, powders, and tinctures, which can be derived from some combination of the plant's root, flower, or stem.

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In Hassi R'mel, Algeria, 260 miles south of Algiers, construction has begun on a new power plant using a combination of solar and natural gas.

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But scientists believe that the combination of foods in a predominantly plant-based diet may.

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The Isle of Wight, off the south coast in the Solent, aspires to become self-sufficient in energy over the next few decades through a combination of tidal power, a waste-to-electricity plant and efficiency savings.

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