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It might mean eco-friendly.

It means the products used lack toxins and are considered eco-friendly. Shit like henna for example isn't toxic but ink pens are. Recently...

I just went to look up what it means, to the city of Portland, and this is what I found...

Probably that they re-use the needles, but only from people who promise very hard and swear on the first Pokemon manga that they have no infections.