Toronto's Gardiner Expressway was built for 70,000 vehicles a day but carries 200,000. As officials debate how to deal with this aging piece of infrastructure, one architect wants to protect it with a green roof. Les Klein, principal and co-founder of Toronto-based Quadrangle Architects Ltd., is floating plans that would add a seven-kilometre, landscaped roof over the elevated highway, keeping it intact by reducing exposure to the elements while also creating recreational parkland above the roadway. Other alternatives include tearing it down or moving it underground, reports The Globe and Mail. Read More