Just like energy and entropy, it becomes harder to harvest efficiently. There's still just as much water, it's just not easily accessible. The difference betwee

Just like energy and entropy, it becomes harder to harvest efficiently. There's still just as much water, it's just not easily accessible. The difference between the water in your glass and the water in the cubic foot of earth after you spill your glass on it. You can't drink from the latter. The water cycle does the collection for us (lakes, rivers, aquifers) but we're draining them faster than they can recharge, particularly problematic are the melting glaciers (in the Himalayas) and the aquifers: https://en.wikipedia.org/wiki/Aral_Sea https://en.wikipedia.org/wiki/Aral_Sea https://www.washingtonpost.com/news/energy-environment/wp/2015/12/03/alarming-research-says-humans-are-using-up-far-more-water-than-previously-thought/?utm_term=.129e41e12062 https://www.washingtonpost.com/news/energy-environment/wp/20... http://lcluc.umd.edu/hotspot/glacial-retreat-himalayas http://lcluc.umd.edu/hotspot/glacial-retreat-himalayas https://www.nasa.gov/feature/goddard/2017/11-percent-of-disappearing-groundwater-used-to-grow https://www.nasa.gov/feature/goddard/2017/11-percent-of-disa... https://www.jpl.nasa.gov/news/news.php?feature=4626 https://www.jpl.nasa.gov/news/news.php?feature=4626