Where Have All the People Gone (1974)

A bizarre occurrence of solar flares devastates Earth's population, sparing only a select few who possess an unexplained immunity. As animals descend into madness and humans disintegrate into a fine white dust, only their abandoned garments remain. The few survivors must navigate the desolate landscape and confront the challenges of a world stripped of civilization. Struggling to adapt and find meaning in their new reality, these individuals band together in a desperate attempt to rebuild their lives amidst the eerie remnants of humanity.