The share of the surface of the earth in very urban areas is roughly ~0.3%

The share of the surface of the Earth which is very urban turns out to be a recurring question when estimating various catastrophic risks, like asteroids or volcanoes. Once we estimate the frequency of such events, we want to estimate the chance that they&rsquo;d hit an urban area. There is some pre-existing literature on the topic, but I thought that making my own estimate would be quicker and…