Final answer:
Sustainment support to populations generally occurs when a society takes action to meet its health and survival needs without exceeding the ecosystems' capacity to support it, influenced by sustainable land management, agricultural productivity, and climate change.
Step-by-step explanation:
Sustainment support to populations generally occurs in the context of society's efforts to maintain the health and survival needs of a population within the carrying capacity of the local, regional, and global ecosystems. When populations approach or exceed sustainable limits, ecosystems can degrade, leading to insufficient resources to meet the needs for food and water. Sustainable land management and agricultural practices play crucial roles in achieving food security, especially in the context of climate change, population growth, and resource depletion. Increasing agricultural productivity sustainably is essential for supporting rural and impoverished urban populations that often suffer from inadequate access to food. Policies and initiatives aimed at restoring peace and security, managing water resources, and promoting sexual and reproductive health can help to foster resilience and sustainability.