The water-food-energy nexus is central to sustainable environmental management and development. The demand for water, food, and energy are increasing, driven by climate change, a rising global population, urbanization, and economic growth. Agriculture is one of the largest consumers of freshwater resources, and more than one-quarter of the energy used is consumed on food production and supply. Therefore, the high demand for energy and water needs proper management for sustainable water and food security. We are currently working on a Climate-Smart Agriculture to address the WEF (water-energy-food) Nexus approach, which holistically considers the dynamic interlinkages between water, energy, and food resources. Among this, we are working on appropriate irrigation water management by monitoring the soil moisture dynamics by adequately supplying water based on the crop requirement. Our work also focuses on water and associated resources, including a unique analytic tool for quantifying climate change impacts on water resources based on different scenarios, and ultimately produces sustainable water management in the changing climate.