Today's planes contain up to 50 percent composites. A composite is a material consisting of two or more substances with different properties-usually a plastic resin with glass or carbon fibers mixed in. The fibers make composites extremely strong without adding much weight.
The only problem: These types of composites aren't very eco-friendly. They consist mostly of plastic, which is made from nonrenewable resources like crude oil. Making plastics from oil uses a lot of energy and produces greenhouses gases like carbon dioxide. These composites also typically aren't biodegradable or recyclable.
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