Technological History

Transport: The Hard-to-Decarbonize Sector # Transport accounts for about one-third of final energy consumption in most industrialized economies, and it remains overwhelmingly dependent on petroleum fuels. In Austria, the transport sector consumed 361 PJ in 2020—virtually all from oil-derived fuels. Decarbonizing transport is therefore essential to any serious climate strategy. But which technology pathway makes the most sense from a physics standpoint?

The Baseline: Human Energy Needs # Before examining modern energy consumption, we should consider the baseline: how much energy does a human body actually need? The answer is approximately 7 MJ per day (about 2,000 kcal), assuming moderate activity. This represents the absolute minimum energy throughput required for human survival.

The Role of Science in the Energy Debate # If we were guided by science, there would be a lot less hot air and more informed debate around energy. Nothing in society is possible without the availability of sufficient energy. Nothing. Energy is a fundamental prerequisite of life and represents a particularly important factor of everyday life.

Zhang Heng's seismoscope used an inverted pendulum to detect distant earthquakes and indicate their direction, pioneering seismological science in ancient China.

Archimedes and ancient engineers built mechanical planetariums (orreries) that encoded astronomical computation in bronze using differential gearing.

Heron of Alexandria's inventions, including the first steam turbine and programmable automata, demonstrated advanced mechanical automation and energy conversion in ancient times.

The South-Pointing Chariot used complex differential gearing to maintain orientation, demonstrating advanced mechanical computation for navigation in ancient China.

The discovery of the Antikythera Mechanism reveals the world's first analog computer, a sophisticated astronomical calculator from ancient Greece that simulated celestial movements with precision gears.

How Roman aqueducts used inverted siphons to cross valleys, demonstrating advanced understanding of pressure and hydraulics.

The Barbagal Mill complex as an ancient example of automated industrial production using cascading water wheels.