Heat-trapping gases -- See Greenhouse gases Here are entered works on gases that are present in or added to the atmosphere, such as water vapor, carbon dioxide, methane, nitrous oxide, ozone, and chlorofluorocarbons, and that absorb radiation and increase atmospheric temperature.
Heathenism -- See Paganism Here are entered works on polytheistic religion of ancient or traditional origin. Works on the 20th century revival of polytheistic faith centered on the worship of the Great Mother Goddess are entered under Neopaganism.
Heavenly comedies (Motion pictures) -- See Fantasy comedies (Motion pictures) Here are entered films that feature benevolent intervention by mythological or supernatural beings with comic results, or that feature incredible inventions or machines having a mind of their own.
