A tremendous amount of water is used globally for agriculture. It’s estimated the world’s population by 2050 will be around 9 billion, and if we do not reduce our water usage, there won’t be enough fresh water to go around. Alternative methods of agriculture (aquaponics for instance), composting toilets, and low flow fixtures can all help! (see http://www.green-trust.org/products/ for ideas)
Infographic by Seametrics, a manufacturer of water flow meter technology that measures and conserves water.