RWP was born in Manchester, in the north of England, in the late 1950s, so he is very old. He really liked the north of England, which by 1965 was hip and had three TV channels, and where he went to a coed school. His parents, for reasons best known to themselves, then yanked him away, to Belfast and then Dublin, which had one TV channel that started up at 6 pm with the Angelus (Catholic call to prayer). He also had to go to an all boys school, where he realized he really missed girls. This probably let him focus on schoolwork, though, and at age 19, after he had finished college, he set off for America, where he still resides. He has a bachelors degree in biochemistry and a Ph.D. from Harvard in biophysics, and has lived also in Mainz, Germany, Setauket NY, and Richland WA. He currently divides his time between Nebraska, Rosslyn VA, and Florida.

Tuesday, September 23, 2014

Oh how I love to be lectured on climate change by Leonardo diCaprio

Leonardo DiCaprio notoriously rented the superyacht Topaz to bring his pals to the World Cup. Just for fun, I decided to calculate the carbon footprint of the Topaz. At service speed (23 kn) it operates two large diesel engines at a total horsepower of 15980 horsepower. 1 horsepower is 745.7 watts, so the Topaz generates 11.9 MW of power. Since a marine diesel is pretty efficient, sometimes exceeding 50%, let's say this comes from 23.8 MW of heat generation. At 48 MJ/kg, this requires burning about 0.495 kg, or slighly over a pound of diesel fuel a second, to give 1.279 kg of CO2 per second.

A typical American home uses 10837 kWh of electrical energy per year. That corresponds to 1.236 kW of average power usage. Given the average coal plant operates at 33.8% efficiency, that corresponds to 3.662 kW thermal generation. At 24 MJ/kg, this requires burning 0.152 grams of coal per second, generating about 0.447 g of CO2 per second.

Dividing the two, we calculate that the bold ecowarrior Leonardo, on his trip to the World Cup, was generating as much CO2 as required to supply electricity to 2860 American homes, or around 6000 people. A small town, in other words.

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