The words global warming used to mean something. When the term became popular in the early 1990s, it sounded like something out of a science-fiction movie. Today, however, it is thrown around casually and most people seem to have forgotten its implications. (Similarly lost is the significance of April 22 — Earth Day; don’t pretend like you remember.) Of course, there are those dutiful citizens who are doing their best to combat global warming: refusing plastic bags at the bodega; driving under 60 mph with the windows up and the air-conditioner off; and buying recycled paper towels. But the actions of a few have next to no impact on global climate change.