Unlike oil, salt and water are reusable and also among the most abundant elements on earth. There is no shortage of either one to last humanity through eternity. Except without energy, we just can’t make good use of them. This has been the struggle throughout human history until about 100 years ago.
Mark Kurlansky’s book, Salt: a World History, tells the world’s history from the angle of salt and I will never view this commodity substance the same.
Earth has a huge amount of salt. Coastal places clearly have sea water. Inland areas usually have salt mines, sometime as big as a mountain, or salt lakes. Then there are brine springs all around the world. To extract salt from them, we need energy: to dig, to evaporate, to distribute. Historical major saltworks were usually at the location where all three were together: free flowing brine spring, big mountain of rock salt, or long coast lines; forest, coal mine, natural gas, or good weather for solar energy; and river, canal, or sea ports. All those places became major cities which, in turn, shaped most of our history.
Until canning and refrigeration, salting was the only way to preserve food: meat, fish, dairy, and vegetables. Therefore it became the element for survival. Without salt, people could not preserve food and would starve when there was no harvest or the weather turned bad. Salt also won or lost wars. Soldiers needed food to fight; food needed salt. No salt, no rations, no soldiers, no winning. Surprising number of wars were decided by the control of salt. For the US civil war, Union controlled salt better than Confederacy and eventually won.
Many of my favorite foods: smoked salmon, ham, bacon, kimchi, thousand-year egg, etc. came from the old days when salting foods was an everyday business. I learned that Chinese prefer to cook with already salted ingredients: soy sauce, dou-ban, dou-shi, zai-cai, etc. instead of sprinkling salt directly. I also learned how salt makes meat tender by breaking down the protein. This explains the working of curing meat, also why brining chicken makes them tasty.
With cheap energy, salt will be the easiest problem to solve. And the solution is right in front of us: nuclear. Almost all nuclear plants require cooling and what better to use than sea water? Cooling with sea water is the same as heating them up, salt just comes out of that process.
I cannot say this book is a page turner and all those ancient recipes became boring at the end. It surprised me many times with fresh angles and factoids unknown to me. Salt shaped much of human histories and has been largely forgotten, just like many of those cities used to thrive with saltworks. Next time I go to ChengDu, I would have a different perspective for the city.
One Response to Salt