 produced by the system will eventually be divided among the various players in the system. If one group gets more (say, those receiving interest income), then other groups will necessarily receive less.
Another important point to note is that as new products are added, old ones disappear. For example, once cars came into use, we lost the ability to go back to horses and buggies. There are no longer enough horses; there are no longer facilities to “park” the horses in downtown areas, while at work or shopping; and there are no longer services to clean up after the mess that the horses make.
Without being able to go backward, the system is quite brittle. It would appear that under sufficiently adverse conditions, the entire system could collapse. In fact, we know that many ancient civilizations did collapse, when conditions weren’t right.
The strange interconnections of a networked system make the world economy behave in a different way than we might initially expect. Later in this presentation (in Part 2 of the write-up), I will show some examples of inadequate energy supplies leading to very different results than high prices.
The model of The Limits to Growth looked at how long resources might last, before the growth of the world economy came to a halt from a variety of problems, including a lack of easy-to-extract resources. In some ways, the model was quite simple. For example, the model did not include a financial system or debt. In the single most likely scenario, the base run, the world economy hit limits about now, in the 2015 to 2025 time period. The authors have said that, once limits are hit, the forecast on the right-hand side of the chart cannot be relied upon; the model is too simple to forecast how the down slope might actually occur.
The pattern of world energy consumption seems to be one of rapid growth, especially in the period since World War II.
Energy consumption growth is particularly high in the period covered by the red box. In other words, energy consumption growth is particularly high from the 1940s through the 1970s. If the economy relies on energy, we would expect this to be a particularly booming period for the economy.
We can break energy consumption growth down into two components: (1) the portion to cover higher population, and (2) the portion to cover improved standards of living. Looking at this chart, it is clear that “higher population” takes the majority of the increase, except when increases are very large.
I have labelled the three big bumps with my view of what seems to have led to them. The first is early electrification, when street cars were added and when the early mechanization of farming was implemented. The second is the postwar boom and the third is the recent period of globalization, led by China’s major ramp up in coal production.
China’s energy consumption grew rapidly after it joined the World Trade Organization in 2001. The thing that most people don’t realize is that China is reaching limits on its coal extraction. Its coal production seems to have peaked about 2013. Its comparatively tiny amount of wind and solar (shown in orange on the chart) is not making up the shortfall. Instead, China is being forced to rely more on imported energy. Imported energy tends to be higher in cost, and may be limited in supply. For all these reasons, we cannot rely on China to continue to power future world economic growth.
It is not just China that gets only a small share of its energy production from wind and solar. This is also true of the world as a whole.
Boxes 1 through 4 show a different model of how the world economy works than that shown earlier (in Slide 9). In Slide 20, the Economy (in Box 3) acts like a giant factory. It uses Resources of various kinds (a few of which are listed in Box 2) to make Goods and Services (a few of which are listed in Box 4). If the Economy is getting to be more and more efficient, Box 4 will expand much more rapidly than Box 2, producing a great abundance of goods and services. If this happens, all of the Resource Providers in Box 1 (plus some I