Cascading Risks and Adaptive Deficits: A Review of Climate Change Impacts on Pakistan’s Water Security

This review synthesizes the climate vulnerability and cascading risks to Pakistan’s water security, analyzing the convergence of physical changes and institutional weaknesses over the period from 2003 to 2023. Climate change in Pakistan is viewed as a risk multiplier that intensifies existing social and governance fragilities. The review identifies three converging physical stressors that accelerate cryospheric retreat, leading to the peak water paradox in the Indus River Basin (IRB); a divergence between observed streamflow declines and future model projections, which hampers planning; and increasing flood-drought whiplash, exemplified by the catastrophic 2022 monsoons. Significantly, groundwater depletion is primarily driven by unsustainable human extraction rather than climate-driven recharge deficits alone. Systemic vulnerability manifests as declining efficiency across the Water-Energy-Food (WEF) nexus and an inability to manage complex trade-offs in reservoir management. These challenges are further magnified by an adaptive capacity deficit, characterized by ongoing policy implementation failures and the urgent need to modernize the Indus Waters Treaty (IWT), whose assumptions of stable flow are now outdated. The review concludes by proposing an integrated, systems-based research agenda centered on Hydro-Agro-Economic modeling that dynamically links hydrology, socioeconomic drives (such as urbanization and energy markets), and governance. This shift is crucial for transitioning from reactive disaster response to proactive, evidence-based adaptation planning.