Energy: The Ultimate Substitute for Land
June 14, 2026 Leave a comment
Elon Musk’s recent talk focused on the Kardashev scale – a framework for measuring civilization’s advancement by its energy consumption – and argued that moving up that scale requires expanding into space. Which invited comments like this: “I’m sick and tired of his shtick about Kardashev. I get it. The sun has lots of energy. But why would I care what % we’re using!? Why would that be a goal?” The reason is simple: energy that is super-abundant (and that means cheap) makes a lot of other things possible. The entire progress of human civilization can be seen as harnessing more energy – from human muscle alone to animals, wind, sun, water, combustion, nuclear fission. If we find better sources of more abundant energy, we’ll make human life even better.
As an example, let’s look at farming. For some time in the 20th century, there were concerns about carrying capacity – the ability of the Earth to support a fast-growing population. Vertical farming was one possible solution. Vertical farming is the practice of growing crops not in soil but in water or air in large buildings resembling hangars or warehouses, where crops are stacked many levels high. Recently, Matt Farrel made a video asking “Why This Vertical Farm is 500x More Efficient Than Farming”. The short answer is that while it is 500x more efficient by land use, this metric doesn’t tell the whole story. While vertical farming is immensely more land-efficient, it has struggled to achieve commercial success due to significantly higher costs compared to traditional farming:
- Energy: Traditional farming relies on a free, abundant energy source: the Sun. Vertical farming requires a massive energy input for lighting and climate control.
- Labor: It requires skilled tech workers who command higher wages than traditional farm hands.
- CapEx: There is a lot more machinery and infrastructure involved, and it is more expensive.
Vertical farming struggled to turn a profit. The anxiety about the Earth’s ability to support a growing population has largely faded now that it’s clear that there won’t be a runaway population growth. And yet, the mere fact that vertical farming can produce crops is great news for the long run, because it proves a vital point: when enabled by technology, energy can be a substitute for arable land. No land – no problem! This is great news:
- For the Earth this means that carrying capacity in terms of agricultural land is not going to limit us. We can feed far more people; we just need energy.
- Beyond Earth, this means that a human future on Mars and other space destinations is possible. Even without sufficient sunlight or native soil, we can still feed a planet.
As they say in the aerospace industry, “With enough thrust, even a brick can fly.” With enough energy, we can feed worlds. And we can do a lot of other things in other spheres of human activity. That’s why the Kardashev scale matters. A civilization that has a lot of energy is a more advanced and prosperous civilization.

