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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For example, in the ethanol business, it is almost inconceivable that there is any investment in plant or equipment whose return matches that from the political investment that has provided the industry a combination of direct subsidies, mandated use, and protection from foreign competitors.

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