In our 50th (!!!) episode, Tiffany teaches Kat about the idea of "clean diesel" and how the U.S. government has been pushing it. Does it exist? Is it something you can use to live a more eco-friendly lifestyle? Or is it just a bunch of green hooey?
Sources 

• EPA on NOx: https://www.epa.gov/no2-pollution/basic-information-about-no2 
• US Department of Energy: https://www.fueleconomy.gov/feg/di_diesels.shtml 
• Scientific American on “clean diesel”: https://www.scientificamerican.com/article/can-diesel-finally-come-clean/ 
• International Council on Clean Transportation: https://theicct.org/sites/default/files/Gas%20_v%20_Diesel_%20CO2_emissions_%20EN_%20Fact%20_Sheet%202019_05_07_0.pdf 
• Performance results on ducted fuel injection: https://www.sae.org/publications/technical-papers/content/2021-01-0503/ 
• Impactful Ninja: Carbon footprint of biodiesel: https://impactful.ninja/the-carbon-footprint-of-biodiesel/ 
• Car Talk: https://www.cartalk.com/content/car-talks-guide-alternative-fuels-0 

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