Ahahah, lol :D It does work, it's just hard :)
Plus you get anger and sadness ticking if you are low energy or low on entertainment. So you need to have both of these high and get touched by green influence quite a few times :D Which is pretty hard, but doable :)
Also each age the previous emotions get normalized, so it's way harder to go for green at the begining of each stage, but pretty hard to recover within a stage of you got too angry or too sad :)