My libertarian viewpoint is that externalities should be accounted for, and should be accounted for in the least freedom-constraining way. I don't want to force people to buy small cars if they want to buy big ones, or to live in the city if they want a yard in the exurbs. But if they make those choices they should pay for them, precisely the same as people pay for more expensive food or clothing if that is the choice they make. The difference is in how immediately the costs show up.
Where I differ from the liberals/statists is that I don't believe in mandates or compulsion. Incentives, yes - compulsion, no. And for me, this is largely a foreign-policy initiative that is critical to the country's long-term independence and ability to maintain its principles without having to make concessions to the worst regimes on earth merely because they sit on a pool of petroleum. Before the need for petroleum we never had to put soldiers in the Middle East, and in fact pretty much ignored the area. We have soldiers in the Middle East now because of oil. We care about Iraq and Saudi Arabia and Iran because of oil. We don't have private foreign policy in this or any other country - this has to be a public policy issue.
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