How to deal with alma mater pushing crack science?
Do not intervene.  It won't work, and may damage you.

Political and ecological matters can be highly divisive.  No project has zero impact, so even if everybody agrees about the facts, strong disagreements in the balancing of pros and cons are likely to remain.  Therefore, the most likely outcome of trying to intervene is that you make enemies, without being one step closer to your desired outcome.  It is very unlikely that you will be able to convince students and faculty that they should change their opinion or actions on this.