High population growth is accelerating land crisis. At a same time green cover is decreasing rapidly all over the world. In urban areas, the rate is even severe.
The countries (for instance Bangladesh), urban greenary is decreasing swiftly over the years specially in cities. So it's time to know the barrier to expand forest cover and remove the barrier ASAP.
Urban forestry can be a sustainable solution. But, What are the major problems to establish urban forestry except land crisis?