Morning fog drifts across downtown as landscaper Graham Reid cuts the grass on top of the Vancouver Convention Centre's living roof in Vancouver, British Columbia October 17, 2013. The roof is the largest of its kind in Canada with over 400,00 indigenous plants and grasses from 25 different species of the Pacific Northwest of North America. The plants and grass are trimmed every autumn at the end of the growing season. REUTERS/Andy Clark (CANADA - Tags: SOCIETY ENVIRONMENT TPX IMAGES OF THE DAY)