> It takes 1.1 gallons (5 litres) of water to grow one almond, and thanks to the big profits they bring in, almond orchards continue to be planted (this isn’t to say cow’s milk, which takes about 100 litres of water to produce 100ml of milk, is more environmentally friendly – more that its production is not concentrated in one area of the globe).

cf: https://www.theguardian.com/lifeandstyle/shortcuts/2015/oct/...