greengasm

The reaction an enviromentally friendly person has when they see/buy/hear about/do something good for planet Earth

The warm and fuzzy feeling one gets after becoming ecologically enlightened; usually induced by listening to a ruddy south-westerner talk about off-the-grid construction, having an Australian permaculturist walking you through a food forest, or watching a Discovery Channel film about nature.

This is usually coupled with a gereric environmental-personal-responsibility lecture on the come-down when given by ecologically inclined scientists, often mistaken for global warming rhetoric by the less educated.