Research Aim: This research will shed light on the role of urban forests in the city’s sustainability. It will show an ideal level of urban foresting helps city administration achieve sustainability. Moreover, it will compare various megacities across Europe to show how they have managed urban foresting and helped make cities smart and sustainable. Lastly, after reviewing multiple urban foresting and sustainability models across Europe, it will recommend a holistic model applicable across the globe to achieve sustainability and human development.