It isn't just transportation. Don't forget that without oil we will lose plastics, a majority of our large crop fertilizers. The impact on food will be one of the biggest issues. Of course that rolls back to transportation again, all of the goods, foods, and products we use aren't built or produced in the city we live in and for most of us, local production would take some time to get started, it wouldn't happen quick enough. If tomorrow we had a deep oil crises the economy would tank.
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