Environmental ideals, customary international law, and negotiated agreements

When there isn't an international statute prohibiting one nation from causing environmental damage to another, where do scholars look for legal rules? The opening says they turn to customary international law: principles reflected in how nations already behave toward one another, even though those principles haven't been formalized in statutes.

The word customary matters. We need to distinguish a rule countries actually follow from a standard they merely say they support. A country could announce that it opposes pollution while continuing to release pollutants that reach its neighbors. Its public statement and its behavior would tell us different things.

The first paragraph introduces two principles that scholars commonly treat as established customs. One concerns transboundary harm: a nation should prohibit activities within its borders that significantly damage the environment beyond them. The other is precautionary: nations should take care not to expose other nations to a significant risk of environmental harm. One emphasizes preventing harm and the other taking precautions against risk, but both concern effects that extend beyond a country's own borders. The question will be whether countries actually live by them.

The second paragraph gives us the test. To count as a norm of customary law, a principle must be followed in practice. Saying that it is desirable isn't enough. Talk is cheap; look at what nations do.

Now the author applies that test. Pollutants constantly cross most international borders, and nations rarely try to remedy the situation. This is evidence that their behavior doesn't match the two principles. The author acknowledges that systematic studies are lacking, so we shouldn't pretend we're looking at a comprehensive measurement of every country's compliance. Still, ordinary experience gives the author a reason to challenge the description of these principles as established customs.

The third paragraph turns the criticism toward the scholars. They say actual conduct determines what counts as customary law, yet their debates rely on what nations profess. That's an inconsistency in how they apply their own standard. A promise to behave a certain way can't, by itself, establish that the promised behavior is customary.

What do these environmental principles actually do? Nations use them to defend their own actions and criticize other countries. They express shared ideals: standards countries invoke when arguing about what should happen. The author calls that an ideological system. The point isn't that all international law is imaginary or that protecting the environment doesn't matter. It's that these particular ideals haven't met the behavioral test for customary law.

So should scholars ignore the ideals entirely? The final paragraph suggests a more useful role for them. Treaties and direct negotiations, rather than court decisions, are now the principal ways international environmental disputes are resolved. Scholars should study how affirming shared principles can help countries negotiate and form agreements.

That changes the question. Instead of treating a country's professed commitment as proof of an existing legal custom, ask how that commitment could contribute to an agreement that actually holds the country to an environmental standard. The ideals may help build effective rules even though they aren't evidence that nations already follow those rules.

The overall criticism is that scholars have focused on the wrong things: professions rather than practice, and customary-law grounds for court decisions rather than the growing role of treaties and negotiations. The constructive recommendation completes the argument. Redirecting scholarship toward those agreements offers a more promising way to address environmental conflicts.