It took Montreal 30 years to pay off the debt incurred for hosting the Olympics. Host cities build vast infrastructure that is essentially disposed of after the games because there is no possible use for it absent a world event that is not going to return. Paris brags about being the “greenest Olympics ever,” though clearly they are not including the vast environmental impact of inducing millions of humans to migrate across the world releasing megatons of CO2, and temporarily housing them in a place that cannot support them except in a massively unsustainable manner.