A bunch of Hollywood types in, uh, England got together to make a fun movie about how people should try to reduce the carbon emissions, even though it's too late. (Ha ha, what is happening in Los Angeles today? How about DC and New York?) Anyway this is the movie the group made and then hid, and then apologized for:
And now it's all over the Internet and the usual people who say "Agh the pagan environmentalists want to kill us all, for Mordor" are saying these things on the Internet.
This is where you pull beside the guy, give him a smile and a thumbs up, tell him "Nice ride!" and then ask what kind of mileage he gets.