Part of the residue from the decline in American manufacturing is an abundance of empty factory buildings that once housed workers and machinery.
The building in this photo once produced machinery for Harnischfeger Industries in Milwaukee.
It is now home to a prototype aquaponics business. It produces both fish and fresh vegetables.
There are aquaponics, hydroponics and sub-irrigated planter (SIP) food production opportunities like this in empty buildings all over the country. These buildings represent a significant potential for new green business opportunities and new green jobs.