The only protest should be to have no kids. Its a pity for those who do because kids are great but if there was a movement to not have kids for the sake of the environment I'd appreciate those people's resolve to not have any while the majority enjoy the fun. Especially if they contributed to child care to make a better society, eg get involved in education, sports and arts. They should become leaders in making a happier, healthier, fairer society for all. They should welcome immigrants because we need them if we have less kids and we should accept that our cultures will become less and less traditionally "Western European". Over a few generations this could catch on globally and we'd have a sustainable world. But it needs selfless people to start it without meanspiritedness.
Instead they rage and act like the spoiled kids.
IMO at least.