That depends on what you’re meaning by “delivery vehicles.” The world’s number one polluter right now, in transportation, is actually oceanic shipping. The greatest impact would actually be the easiest to bring about: change commercial seafaring to cleaner options. That’s far less than road-going transportation, in terms of numbers to be changed, and far easier given that most of the world’s largest users of that shipping at least give lip service to the idea of climate change.
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