It’s hard to imagine a force strong enough to pull Boston Mayor Thomas Menino, hemp-wearing econauts and an enormous pile of processed elephant dung into the same room — but last weekend’s Going Green Expo did exactly that.

In its Boston debut last weekend, the fledgling Going Green Expo did an admirable job of demonstrating the breadth of what “going green” can mean — with over 150 exhibitors showcasing everything from industrial washing machines to clothesline advocacy; from health-promoting cookware to paper made from Sri Lankan elephant poop.

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