Urban park environments are improved with increased density and diverse activity and use, according to a recent article on the Trust for Public Lands blog. In addition to creating demand for urban parks, density also provides opportunities for parks to sustain themselves financially. Park advocates and philanthropists, many of whom live or work near their parks, contribute funding and volunteer hours. Learn more: http://cityparksblog.org/2012/04/05/urban-population-growth-creates-new-demand-for-parks/