Why is GREEN associated with envy?......origin of idiom?....?

...we turn red if we're angry , or embarassed.....blue if we quit breathing......pale white if we're scared.... yellow if we're sick.......black if we're dead.......brown if we're left out in the sun too long....orange if we eat too much vitamin A..... but green?....no offense to Martians ,... show more ...we turn red if we're angry , or embarassed.....blue if we quit breathing......pale white if we're scared.... yellow if we're sick.......black if we're dead.......brown if we're left out in the sun too long....orange if we eat too much vitamin A..... but green?....no offense to Martians , or leprechauns.....I've just NEVER seen a green person...where did this observation begin?.....
Update: .....wow...you guys are the best...all of you........but ........"Houston.....we have a problem...the city has a cloud of smoke over it.....because........DHW IS ON FIRE.......
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