Final answer:
Urban farmers confront challenges such as economic pressures, environmental sustainability issues, and limited access to resources and agricultural knowledge.
Step-by-step explanation:
Urban farmers face numerous challenges, three of which are particularly key in affecting their productivity and sustainability. First, economic pressures make it difficult for urban farmers to enter and remain competitive in the agriculture market due to high costs and the scarcity of affordable, productive land which is often threatened by urban development. Second, urban farmers deal with environmental sustainability issues, such as soil degradation, which impacts the productivity of their land, and climate extremes that affect yield and the reliability of seasons. Lastly, access to resources such as improved crop varieties and agricultural knowledge is often limited, which is compounded by an information gap, making it hard for them to implement sustainable and efficient farming practices.In conclusion, urban farmers must navigate through financial hurdles, environmental constraints, and informational barriers to achieve success in their agricultural endeavors.