Book excerpt: More trees. Hydrogen-fuelled cabs. Urbiology. A new model of taxation. Solar panels on big-box stores. The art of salvage. Composters for dog poo in city parks. Retrofitting our urban slabs. Gardening the Gardiner. Ravine City. What would make Toronto a greener place? In the third volume of the uTOpia series, dozens of imaginative Torontonians think big and small about sustainability. From suggestions for changes to our transit system and more mixed-use neighbourhoods to a tongue-in-cheek proposal for a painted line aroudn the city and a short comic book about Toronto in the year 2057, GreenTOpia challenges the city and its residents to rethink what it means to be green in a metropolis, and how to take their love of the city one green step further. Other pieces include an interview with Mayor David Miller and a breakdown of the ecological impact of our morning coffee. GreenTOpia features photos, maps and a 56 page green directory of resources, organizations, incentives and programs promoting sustainability in the GTA.