Math-loving Seattle resident Akash Shendure (top right) began the exhaustive effort just a few months ago, and has since amassed a list of more than 150 ultrarich people and their families, ranked by the estimated emissions they generate by flying privately. Recognizable names topping the list include Kim Kardashian (center and inset, her jet) and Kylie Jenner (bottom right). The worst offender, however, was Silicon Valley entrepreneur Tom Siebel (left) - who, like many on the list, has spoken out about the dangers of climate change. According to Shendure, the billionaire is responsible for 4,649 tons of yearly emissions. For reference, the average American emits 15.52 tons of carbon dioxide per year, meaning many of the celebrities and tycoons to grace the list each year generate more hundreds of times the pollutants of a typical US citizen. Siebel's carbon footprint, for instance, is equal to that of more than 299 typical US citizens.
