An Eco Rap was sang in the episode, The "Good Old Days!", when Timmy tuned into Captain Green and the Eco Teens.
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Timmy wanted to turn it off after hearing Captain Green start to perform a lame "Eco Rap". The lyrics are: "Ra-ra-rainforest, I said, ra-ra--", but they quickly got cut off since Pappy changed the channel to violent 1930s cartoons. There is also a Captain Green rap about eating right that Mr. and Mrs. Turner sang from when they got back from a Captain Green and the Eco Teens convention one night; its lyrics are "Nutrition-nu-nu-nutrition".