I call myself a Libertarian sometimes, but I have always had a problem with Libertarianism when it comes to externalities in general and the environment specifically.
Here is the problem:
I am a toxin manufacturer in Libertaria. Because I live in Libertaria, I can do anything with my property, on my property as long as I don’t cause damage to anything but my property. Well and good. I decide I am going to store all my toxins in milk cartons, because it is inexpensive and convenient. Well, they leak, polluting the air and the water table and causing lots of damage to everybody in the tri-county area. I am sued for everything I have, but of course this by no means will cover the damages or even the clean up. Now what?
I’ll tell you what happens next: I, being destitute, shack up with some relatives for a couple of months, move out of the tri-county area, and finally get a job with a milk carton manufacturer (I know a lot about milk cartons at this point and, being destitute, I am willing to work for much less than most experienced milk carton designers). I save enough money to buy some land in upstate Libertaria, a couple thousand milk cartons reinforced with duct tape, and the raw materials to resume manufacture of the toxin. My old customers are overjoyed; they were sad when I went out of business (none of them lived in the tri-county area) as I was the cheapest toxin manufacturer in the market. I make millions and spend it as quickly as I can.
Wouldn’t it be better for everyone involved if the government regulated the manufacture of toxins? Maybe passed some laws that made storing toxin in milk cartons illegal? Maybe detailing the type of storage and handling required to minimize the potential for damage if something goes wrong in the manufacture of said toxin? This goes against the entire spirit of Libertaria!
If we don’t regulate the toxin, then at the least we should mandate insurance. The government should require that I, as a toxin manufacturer, should carry a policy that will pay for the clean up and damages in the case that all my toxin spills from my milk cartons, vaporizes, and uniformly coats all the school children in the tri-county area. My behavior will then be regulated by the insurance company which will charge me an arm and a leg when they appraise their risk and find the milk cartons and note their proximity to the elementary schools. In this case though, we will need to regulate the insurance companies; make sure that they have the resources to pay for the skin replacement surgery for the slippery tykes and are not just going to declare bankruptcy and fold up shop when the PTA of tri-county region files a class-action suit.