Civilization grows at an exponential rate, and our technologies and influence over the Earth is ever evolving. It is astounding how different things were 100, 50, even 25 years ago. One large difference is our shift towards the comforts of living indoors, not just as a country, but as a society. In fact, as of around 2008, the majority of the world’s population (and 54% as of 2014) lived in urban areas. This is the first time in the history of the world that this has happened (UN 2014).