The red, yellow, green are the colors of the Rasta flag. The red symbolizes the blood of black people, the yellow the stolen gold and the green the lost lands of Africa.
The Rasta flag can also be seen during coptic celebration in the motherland Ethiopia. These colors are too on the senegalese flag, from where thousand of slaves were deported, transiting by the Goree island.

Original Rasta Flag The original flag of Rastafarians was Red, Black and Green. Red represented the blood of blacks that died in struggle to fight off their white oppressors. Black represented the color of black Africans skin. Green represented the vegetation of Jamaica and Jah's (God) earth.
Current Rasta Flag The current flag is the old Ethiopian flag with the Lion of Judah symbol. The meaning of the colors in the Ethiopian flag is: red for the blood, gold for the minerals & resources and green for the land.