Consider the organization of this draft. Draft passage: The draft currently begins with no thesis. [1] Some sites contain contaminated soil or lack dependable water access. [2] Gardeners may invest years of work on land they can lose with little notice. [3] Growing produce is difficult to sustain when safety and tenure are uncertain. [4] Soil testing, raised beds where needed, water plans, long-term leases, and links to markets or donation partners can stabilize a project. [5] Policies should also recognize community uses beyond crop yield. [6] Urban agriculture thrives when land security and infrastructure support both safe production and local goals. Which sentence would most effectively supply the missing thesis before sentence 1?