I don't have exact reasons, but I can provide speculations as to why.
In speaking with students during the last election, there was a great deal of frustration in terms of interactions with the candidates who were present. Students felt a disconnect between what they were talking about and what candidates were actually putting forward. There was that element. There was a lack of investment in the causes that were being talked about.
During the last election, climate justice wasn't even deemed to be a topic of conversation that could be broached within the election, because it was deemed to be political, rather than being addressed as an actual issue.