Star Tribune

With new biodigester, students in Columbia Heights schools get lessons on sustainability

Leftover lunch is hardly going to waste at an elementary school in Fridley, where a new machine is turning table scraps into clean-burning fuel to heat the building and compost material to help ...
AOL

With new biodigester, Fridley students get lessons on sustainability

Leftover lunch is hardly going to waste at an elementary school in Fridley, where a new machine is turning table scraps into clean-burning fuel to heat the building and compost material to help ...