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I would like more detail on the calculation for their emissions/km number. In California, they list 148g/km, but the Union of Concerned Scientists has the California electric grid at 93g/km. That's a significant difference, and I wonder if they're taking the production profile of the CA grid into account.

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148 g/km seems to be the default number. I got that same number for two different routes that were entirely located within British Columbia and Alberta, respectively. The problem is that British Columbia has an electricity emissions intensity of about 30kg/MWh while Alberta's is about 600kg/MWh. Hence, this website does not use correct electricity emissions data.

Maybe you can partner with the folks over at https://www.electricitymap.org/ to improve the emissions data?

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