I have often made the claim that hydrology is a place-based science. The premise of this claim is that understanding the dynamics and properties of water at any location requires detailed understanding of the contributing area to that location. Apparently, the time has come for me to broaden my thinking. Hydrology is a global-scale science. It must be if up to 40% of the total rainfall in arid parts of Africa are a result of water vapor from farming practices in South Asia.