KrisCan visits Eric Toensmeier in his Holyoke, Massachusetts home garden that was transformed from a bleakly barren backyard into a thriving oasis of year-round, productive perennial fruits and vegetables. Eric talks about how waste heat from factories and power plants can be utilized for greenhouse gardening; urban food security and self-reliance in the face of diminishing petroleum supplies; edible forest gardens and how they mimic the patterns and designs of ecosystems to create productive perennial polycultures.