The rheology of fluids involved in most engineering problems is inherently intricate, resulting in complex flows. Understanding the dynamics of fluid flows and its connection to rheology has the potential to drive sustainable development – this is the primary focus of my research. In this talk, I will discuss my work centering on the issues of gas emission and turbidity of methane-emitting lakes and water bodies. This concern motivates investigations into the behavior of bubbles rising through non-Newtonian muds [1], the formation of weakened migratory channels [2], the entrainment of liquids as bubbles leave the sediment layer of ponds [3,4], and more. My research approach involves designing experiments, mathematical modeling, and computational studies. I will discuss how nonuniform rheology affects the shape and trajectory of ascending bubbles, and I will emphasize the role of these bubbles in mixing and transport of material.