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Trees, Evil, and Negative Externalities
Trees, Evil, and Negative Externalities
Jul 11, 2025 10:32 PM

It is monplace in discussions of environmental economics to consider so-called “negative externalities,” a technical term for the bad or damaging consequences of an activity that affects those outside the realm of economic decision-making.

For instance, I can make the choice to plant a tree in my yard on my own (presuming there are no regulatory hurdles to jump). A negative externality for my neighbor might be that my tree dumps a lot of leaves into his or her yard and they need to be cleaned up. Typically this level of external consequence is not given a concrete cost…we simply rake up whatever leaves happen to land in our yard, whether they are from trees we do or do not own (I got to thinking about this lately because I had to rake up a bunch of leaves this weekend. Thankfully I caught a relatively warm day after the rain had mostly dried up and the snow had not yet fallen). But if a branch or limb falls from my tree onto my neighbor’s property and causes damage, there may be a level of liability there that would allow for some sort of claim for pensation.

Image: FreeDigitalPhotos.net

It is also mon part of this discussion for environmental economists to observe that we almost never place any concrete costs on positive externalities. I have no ability to charge my neighbor for the pleasure he or she receives from looking at my beautiful tree. I might be able to restrict this positive externality by building a fence and obstructing the view of my tree, but the beauty of the tree is a natural benefit that cannot modified in any usual sense.

Oftentimes these two observations, regarding the costs associated with negative externalities and the inability modify many positive externalities, are made with a somewhat grudging attitude. After all, thinks the economist, it seems unfair that a person be liable only for the bad things that happen because of their economic decisions but don’t stand to benefit because of the good things that happen. So from the economist’s perspective, there’s a bit of inconsistency there.

Common sense intuition runs the other way, however. We ought to pay for the harm that our actions cause, but it’s also appropriate that I can’t charge my neighbor for all the good my actions may do for him or her. In brief here’s a theological reason why the typical view is correct and is right to dominate both people’s thinking on these topics in general as well as the shape of public policy: Good is more fundamental and basic than evil.

This is a view typically associated with Augustine of Hippo, and in summary it simply means that evil is a departure from the good. The world order as created was “good,” for God made it and declared it such. Thus, the good of positive externalities is in some sense more basic than the evil of negative externalities. The harm caused by negative externalties is an evil resulting from the fact that things in a fallen world are simply not the way they are supposed to be.

Our conception that positive externalities are more basic than negative harms is an indirect witness to the priority of the good creation over the corruption of sin and evil. We can abuse the blessings of God’s goodness when we take these gifts for granted, too. But our sense that some norm of justice has been violated when there are negative externalities (and that the gracious order of natural blessings is more basic) is a moral intuition that the world was created good and in some radical way has departed from that original state.

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