I don't care how efficient per product it is to ship stuff. What I care is that the global shipping industry contributes 1 billion tons of greenhouse gasses per year to the problem, and, that if it were its own country, it would be the 5th largest polluter in the world. [0]

In other words, it's not marginal numbers that matter, it's absolute numbers, and something absolutely has to be done about those numbers.

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[0]: https://www.weforum.org/agenda/2020/10/shipping-industry-car...