The term global warming referred to environmental damage on a planet or moon caused by a gradual increase in the mean atmospheric temperature. According to Beverly Crusher, one of the effects of global warming were "profound medical repercussions" for the inhabitants.
In 2367, Data believed that the Beta moon of Peliar Zel II would enter the initial stages of global warming when his predictive model suggested an oncoming rise of temperatures and erratic tide surges. It was caused, in this case, by the Alpha moon using Beta's magnetic field as their exclusive energy source. (TNG: "The Host")