| http://www.w3.org/ns/prov#value | - Although burning the hydrogen is pollution-free, methane is a major contributor to the greenhouse effect of global warming. (See Infrared, Gases and the Greenhouse Effect in the Physics section for more information.) Thermonuclear energy When hydrogen is heated to extreme temperatures, such as on the Sun, the nuclei of hydrogen atoms will fuse to create helium nuclei.
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