It is impossible to do science without measuring  It is impossible to measure without having first selected units of measurement  Hence, science is arbitrary, since the selection of a unit of measurement -- kilometer, mile, fathom, etc
-- is always arbitrary
Some farming on the plains requires irrigation. This irrigation now uses water pumped from aquifers. But aquifers have limited capacity and continued pumping will eventually exhaust them. Thus, a new source of water will have to be found in order for such farming to continue indefinitely.