I've always been torn between the pure and the social sciences.
People often focus on the downsides of population growth but neglect the upsides. These upsides may even outweigh the downsides, making a larger population a good thing overall.
Global actions require local and national participation. International cooperation and action requires community perspectives and legitimacy if it is to be effective.
In many cases, water stress is more about politics, economics, behaviour and governance than absolute water scarcity. Better planning is needed, to allocate water where societal need is greatest, and to allow trade-offs between alternative uses.
Nations are divided, but we citizens need not be.