Of all the possible disasters that threaten American agriculture, the

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"For analysis" is definitely the main problem here. The short explanation is "it's an idiom," but we could also say that "difficult for analysis" doesn't have a coherent meaning. If we add "for X" to an adjective, then that modifier should indicate a purpose for which the modifier is true. For instance, if I say that a pair of pants is "great for skiing," it means that the pants are great for the purpose of skiing, and if I say that a tablet is "useful for note-taking," then it is useful for the purpose of note-taking. So we have an item used in a situation, but the adjective applies to the item itself. The pants are great and the table is useful, at least in those specific situations.

However, we can't apply the adjective "difficult" directly to the possibility of climate change. The possibility isn't difficult; analyzing it is. We also aren't using the possibility of climate change for the purpose of analysis, the way we use a tablet for the purpose of note-taking. Rather, we are trying to analyze something and finding that analysis difficult to do. This meaning is made clear by the infinitive "to analyze," which becomes the true target of difficult. Think about an example such as "The meal was hard to prepare" or "The movie was enjoyable to criticize." The meal wasn't hard and the movie wasn't enjoyable. Rather, the acts of preparing and criticizing were hard and enjoyable. Does that help?

As for other differences, there's not much left to look at! However, we generally use "maybe" to modify whole clauses ("Maybe it will rain today") rather than individual verbs or adjectives. We don't say "She maybe hates me" or "It is maybe the best restaurant in town." This is distinct from the correct use of "may" as a helping verb, followed by the verb "be": "It may be the best restaurant in town."