Lyric discussion by quamp 

Well, in addition to the above pointing out that the green man is a male personification of nature, I think people are avoiding the obvious metaphor here. That is we are all tied to nature and, in essence, married to it. Like many a spouse, treat him right and he will reward you with a rich, bountiful harvest and good life. Be nasty and mean to him, and he will show his wrath, just like he's doing globally.

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