Before starting, clarification of the terms "mixture" and "solution" is in order. These terms are nearly, but not quite, synonymous. A solution unequivocally refers to a homogeneous system of two or more components. This term is applied to liquids and solids, but not to gases. Salt dissolved in water is an aqueous solution of NaCl; a gold-silver alloy is a solid solution of these two elements. However, air is a mixture of oxygen and nitrogen (plus minor species), not a solution of O2 in N2. A multiphase system of a single component is referred to as a mixture of phases. Reference to a mixture of steam and liquid water is acceptable terminology, but a salt solution would never be called a mixture. These semantic distinctions between mixtures and solutions are usually clear from the context in which they are used.
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Global warming is a huge problem which will significantly affect every country in the world. Many people all over the world are trying to do whatever they can to help combat the effects of global warming. One of the ways that people can fight global warming is to reduce their dependence on non-renewable energy sources like oil and petroleum based products.