Learn French: Le fait que le climat change révolte le militant. - The fact that the climate is changing outrages the activist.

It is in the subjunctive! The phrase le fait que requires the subjunctive because it introduces a fact that is being subjected to an emotional reaction or judgment. For regular -er verbs like changer, the third-person singular form (change) is identical in both the present indicative and present subjunctive.

What is the subject of the main verb révolte?

The entire clause Le fait que le climat change (The fact that the climate is changing) is the subject of the sentence. You can think of this whole subordinate clause as functioning like a single pronoun: 'It outrages the activist.'

Does le fait que always trigger the subjunctive?

Yes! Even though a 'fact' sounds certain, French treats le fait que as a subjective framing of a fact, usually to comment on it or react to it. Be careful not to confuse it with c'est un fait que (it is a fact that), which declares a certainty and therefore takes the indicative.

Is militant a 'false friend' here?

Partially. In French, un militant (or une militante) is the standard, everyday word for a political, social, or environmental activist. It does not necessarily carry the aggressive, extreme, or military connotations that the English word 'militant' often implies.