Education is key, subsidize trainings in Permaculture Design Courses
Bring leaders from the Permaculture feild to Vancouver. Support people to take such courses like the one that UBC farm just kicked off.
http://permaculturedesignubcfarm2010.eventbrite.com/
Train children, School farms.
I'm going to Southern Oregon to take this course in two weeks,
http://www.restorationfarm.org/Restoration_Farm/Courses.html
would be nice to have such leaders come here and train. Often in the trainings a portion of the training will be spent transforming a peice of land into a ecological sustainable edible garden.
I am confident that we could become the greenest city, but to do that we will need millions of people working together.
Build healthy soil.
Permaculture and other landscape programs are available to the community are offered by various non-profits and community food groups.