That's not even remotely comparable. There's no academic debate about the efficacy of essential oils. There's wide spread agreement that they do fuck all. Since you like Wikipedia so much: "There is not sufficient evidence that it can effectively treat any condition.[3] Improper use of essential oils may cause harm including allergic reactions, inflammation and skin irritation. Children may be particularly susceptible to the toxic effects of improper use.[4][5] Essential oils can be poisonous if ingested or absorbed through the skin.[5]"
Cloud seeding on the other hand has had mixed results. The problems with it is that it is unclear precisely on the conditions of it working, on how it works in different cloud types, and how it is best used. The problem is that many of the studies on it question whether it can produce rain from incredible dryness. It can't. It does however actively work in inducing rainfall from certain clouds in certain conditions.
If you want the medical equivalent: I don't have a headache now, taking an aspirin will do nada for my head, that doesn't mean aspirin won't solve your headache, it may be able to, which in turn doesn't mean it will also fix a migraine induced headache, which it can't. Fortunately after years of aspirin's effectiveness being a subject of debate among scientists we do have a clear picture of what it can and can't do to your headache. Unlike essential oils which is settled science that it's "alternate therapy" (i.e. scam) for a reason, and unlike cloud seeding which is still actively debated.