1. A "global warming alarmist."

2. One attempting to influence others by scaring them with exaggerated claims regarding the potential threat posed by global warming.

3. One who talks about global warming as though it is a "fact" (i.e., scientists have "proven") that fluctuations in global temperatures are caused by the emission of carbon dioxide and other greenhouse gases that result from human actions.

It is a combination of the "warm" in "global warming" and the "alarm" in "alarmists."

When you eat dirt for the first time and leave your family to build a shack in the woods