I recently came across a fascinating case study of some short-term, low-risk local actions to creating more livable and resilient streets. From Guerrilla Gardening to Chair Bombing to Street Vendors/Food Trucks, community activists and citizens around the country are coming up with innovative, creative and engaging ways of producing change on a human-scale.
Some of these things are probably being done in Pittsburgh now. I know they definitely all could be. I highly recommend that anyone interested in urban livability and resilience give this pdf at least a quick glance for some inspiration from other cities paving the way to a more livable and communal future.