The Colosseum and energy flows
First we can state that powerful and wealthy leaders always have – and presumably always will – build monuments to their greatness. Building arenas to provide the populace with entertainment has always been high up on the agenda. These can be an opera house in Oslo, an Olympic stadium in Beijing, an enclosed arena for skiing in Dubai – and today’s edifices are being built higher and higher the world over. Today, the energy required to build these monuments is provided by fossil fuels but 2000 years ago it was provided by slaves and the food that allowed these slaves to do work.


