These are a couple of my favourite green campaign Ads:
(from the Outsmart Invasive Species Project)
(from Green Peace: Until the Sun Shines out of your xxx (censored to be polite), use an energy efficient light bulb, instead’ - Warning – Video may cause offence!!
What I like about these Ads is that they are amusing or light-hearted, they are introducing a green topic in language most people can understand, they therefore get the message across effectively, they tell a story, and having characters we can either identify with or like, they arouse empathy. The second one is particularly catering to young people who are amused easily where bums, body parts or anything rude is concerned!