Answer:
a college degree
Step-by-step explanation:
The jobs of Urban and Regional Planners affected a lot of people. They are the one that's determine how our cities utilize its land, how communities are designed/rearranged, how to install facilities to properly accommodate the citizens, and how to accommodate the potential growth in population.
This made the barriers of entry to be an urban and regional planner requires years of training/education that could only be found in College. Most Urban planners even only get their job after finishing a Master degree.