Climate-induced disaster risk, societal vulnerability and regional governance in Southern Africa: a systematic integrative review and SADC resilience implementation framework

Technical Summary: Climate-induced disaster risk, societal vulnerability and regional governance in Southern Africa

Problem Statement
The paper addresses the critical gap in understanding climate change in the Southern African Development Community (SADC) not merely as an environmental hazard, but as a cascading disaster-risk governance problem. While existing literature documents sector-specific impacts (e.g., agricultural yields, migration patterns, health outcomes), these studies often treat domains as parallel effects rather than interacting mechanisms within a cumulative risk chain. The central problem identified is that SADC's vulnerability is not solely a function of physical climate exposure (droughts, floods, heatwaves) but is produced through the interaction of these hazards with pre-existing socio-economic conditions (poverty, food insecurity, weak infrastructure) and fragmented institutional capacity. The region faces a "climate-induced disaster-risk trap" where repeated shocks reduce agricultural output, deepen poverty, intensify migration, and overwhelm under-resourced institutions, yet regional responses remain hindered by sovereignty concerns, unequal member-state capacities, and a lack of binding enforcement mechanisms.

Methodology
The study employs a systematic integrative review design, selected to synthesize evidence across multiple disciplines including environmental science, public health, migration studies, economics, and governance.

• Data Sources: The review analyzed 89 sources retained from an initial pool of 110, comprising peer-reviewed articles and grey literature (policy documents, institutional reports) published between 1990 and 2025.
• Search Strategy: Searches were conducted across Google Scholar, ScienceDirect, SpringerLink, and Web of Science, supplemented by reports from the World Bank, African Union, African Development Bank, and SADC institutions.
• Analytical Approach: Rather than a meta-analysis of statistical effect sizes, the study utilized thematic synthesis and mechanism-based interpretation. Evidence was coded into five analytical domains: (1) physical climate hazards; (2) food systems and agriculture; (3) migration, urbanization, and social vulnerability; (4) health and well-being; and (5) business, productivity, and governance.
• Theoretical Lens: The analysis is grounded in Hoffmann's intergovernmentalism theory, which posits that regional cooperation is a product of member-state preferences and sovereignty concerns, explaining why collective action is often limited by national interests and uneven implementation capacities.

Key Contributions
The paper makes four specific scientific and practical contributions:

1. Climate-Risk Transmission-Chain Model: It synthesizes dispersed sectoral evidence into an integrated model demonstrating how environmental hazards (drought, heat, floods) transmit risk through a chain of consequences: from agricultural disruption to food insecurity, livelihood loss, rural-urban migration, expansion of informal settlements, increased disease burdens, and economic productivity losses.
2. Theoretical Extension: It extends intergovernmentalism theory into the domain of disaster risk reduction (DRR), arguing that regional adaptation remains weak because the political logic of sovereignty, unequal member-state capabilities, and weak supranational enforcement override collective-risk logic.
3. SADC Climate Resilience Implementation Framework (SCRIF): It proposes a five-pillar implementation framework designed to transition the region from fragmented adaptation to coordinated DRR.
4. Research Pathways: It identifies specific future research needs, including longitudinal vulnerability measurement, spatial modeling of climate mobility, comparative institutional analysis, and the evaluation of regional adaptation finance.

Results and Findings
The review confirms that SADC vulnerability is a systemic outcome of interacting hazards and governance failures:

• Agriculture and Livelihoods: Rain-fed agriculture is highly vulnerable to temperature increases and rainfall variability. Droughts trigger a cascade of effects including reduced household income, rising food prices, and rural displacement.
• Migration and Urbanization: Climate-induced migration acts as a vulnerability marker. Unmanaged migration expands informal settlements in urban centers, which lack sanitation and drainage, thereby amplifying exposure to floods, heat islands, and disease.
• Health Impacts: Climate stressors increase vector-borne, water-borne, and respiratory diseases. The migration-health nexus is critical, as displacement concentrates vulnerable populations in areas with poor healthcare access, increasing risks of cholera, malaria, and malnutrition.
• Economic Productivity: Climate risks disrupt business operations, supply chains, and labor productivity (particularly in heat-exposed sectors like construction and agriculture), leading to broader economic instability.
• Governance Fragmentation: Despite formal commitments to policy coherence, implementation is uneven. Member states prioritize domestic economic pressures and short-term political incentives over binding regional commitments. The disparity in institutional capacity between states (e.g., South Africa vs. Malawi or Zimbabwe) further complicates a unified regional response.

Significance and Claims
The paper claims that the primary significance of this work lies in reframing SADC climate challenges as a regional disaster-risk governance problem rather than a series of isolated environmental issues.

• From Linear to Systemic: It argues against linear models where hazards automatically produce social outcomes. Instead, it posits that risk is "co-produced" by environmental change and development conditions.
• Policy Shift: The study asserts that resilience in Southern Africa requires a transition from "fragmented climate adaptation" to "coordinated disaster risk reduction."
• Institutional Transformation: It concludes that technical solutions (e.g., drought-resistant crops, early warning systems) are necessary but insufficient without institutional transformation, regional accountability, and sustained investment in the most vulnerable communities.
• The SCRIF Framework: The proposed framework serves as a practical tool to operationalize this shift, linking risk surveillance, climate-smart agriculture, planned mobility, health protection, and accountability-based governance.

The authors maintain a modest stance, acknowledging that the study relies on secondary literature and cannot directly measure causal effects across countries. They emphasize that the proposed framework and transmission chain are explanatory models intended to guide policy and future research, rather than definitive prescriptions for immediate implementation without further localized validation.