Helen Mark visits Birmingham, one of only 59 cities around the globe to be awarded the status of Tree City of the World, part of an international framework for a healthy, sustainable urban forestry programme, an award that's all down to the passion of Birmingham's citizens for trees. Helen meets tree planters young and old, including the tree wardens who ensure people do not mess with the greenery, an academic who runs the Birmingham Institute of Forest Research and an arboriculturalist who gets to work at 6.30 every morning in his mission to extend Birmingham's canopy cover
