Utilizing the Cosmic Algorithm Theory - 12, this paper examines the rapid loss of fungal functional diversity as a systemic driver of ecological destabilization across terrestrial ecosystems. Drawing on recent empirical evidence showing up to ~80% reductions in AM fungal diversity following agricultural conversion, we situate fungal decline within a broader framework of ecological redundancy erosion, delayed regime shifts, and phase-lag collapse dynamics. Using a synthesis of soil ecology, systems theory, resilience science, and human evolutionary behavior, we argue that fungal networks function as foundational stabilizers of ecosystem multifunctionality. Their degradation reduces buffering capacity, masks instability through lag effects, and increases the probability of abrupt, nonlinear ecological transitions. These processes parallel well-established early-warning signals and tipping-point behavior documented across climate, biodiversity, and coupled human–natural systems. The paper further explores how human social organization—particularly large-scale extractive and hierarchical modes of resource management—amplifies ecological vulnerability by accelerating network simplification and suppressing regenerative feedbacks. These dynamics are examined without moral attribution, focusing instead on systemic behavioral consequences across evolutionary and historical timescales. Comparative references to ancient ecological worldviews are included strictly as cultural–philosophical parallels, not empirical mechanisms. Visual synthesis figures integrate fungal mutualism, network thinning under land-use change, phase-lag collapse trajectories, and cross-scale cascade effects to provide intuitive grounding for the analysis. We conclude that current trends indicate not a gradual degradation pathway but a boundary-driven transition toward ecological regime collapse unless functional redundancy—particularly belowground mutualistic diversity—is actively restored. The findings underscore the urgency of soil-centered conservation strategies and challenge prevailing assumptions that ecosystem degradation proceeds linearly or reversibly. Keywords Fungal diversityArbuscular mycorrhizal fungiSoil ecologyEcological resilienceRegime shiftsPhase-lag collapseEcosystem multifunctionalityHuman–environment systemsPlanetary boundaries