The success of modern society gets measured by the strength of the middle class. This group of people has a certain level of security where they can live for today expecting that their standard of living will continue onto the next day and the next. This security allows them to have a diet due their enabled means. That is, they can eat steak and potatoes at every meal or fish and rice at every meal. Even both. The middle class can direct the whole food industry by sheer volume purchasing.
Today we see the middle class directing the global food industry toward a diet with a higher meat content. While this may seem trivial, it’s the scale of the issue which makes this noticeable. For the last few decades over 20 million people on Earth have entered the middle class. Note that the energy production efficiency of flesh to vegetation is 25 to 1 . So it takes 25 times as much effort to produce meat for eating than to produce vegetation. The middle class in 2009 was estimated at 1.8B people and may grow to 4.9B by 2030. Let’s add this up. The food industry will soon need (3.1e9people x 25times x 8700KJ/d*365days=) 2.46e17Joules more energy each year to satisfy the demands of the middle class.
The burgeoning middle class makes for a stable society and a dependable economic model. It may not make for a sustainable future if it decides to try to maintain its diet. More energy will need be allocated to food production. But energy is finite so will another industry give up energy? And what about all the land, feedstock, water, and services needed to grow the meat? Can the flesh eating middle class’s diet lead to a better, sustainable future?