Like the Pilgrim Fathers before her, Greta Thunberg, the po-faced Pilgrim Daughter of the climate cult, set sail for America from Plymouth. Climate puritans, climatans if you will, are particularly numerous among the iGen, those born between 1995 and 2012. This is the generation that was reared on social media —anxious, depressed, self-harming, so risk averse that they demand trigger-warnings to read the classics or attend a university lecture.