Half Sigma reflects on the fact that only about 8% of all working Americans are in the manufacturing sector and the majority is employed in health care, education and public service. So few people works in agriculture that he doesnt even mention them.
It follows that the loss of manufacturing jobs in America does not add much to unemployment and vice versa, the revival of manufacturing will not bust employment. Simply, manufacturing is so efficient and automatic that needs ever fewer workers. America is the number one agricultural and manufacturing country in the world, but its productivity is so high that employ few people.
I imagine that the future will be like farming in Israel, where more people are employed by the Ministry of Agriculture and the Faculty of Agriculture than there are actual commercial farmers.
At the personal level, work opportunities for water engineers are mostly in the public sector, where salaries are withing the range of 2500 to 3500 dollars a month. Independent consulting engineers rarely earn more. The best salaries are in sectors where the workers are unionized, like health, public employees, education, banking. The strongest unions are in Mekorot the Water Company, the Electric Company and the Ports Authority, where engineers earn about 5,000 - 6,000 dollars a month. In fragmented sectors like the food industry, salaries are very low.