How have post-apocalyptic themes in cinema evolved to reflect societal anxieties over the past five decades?

Post-apocalyptic movies have long served as a mirror to societal fears and anxieties, offering a dark reflection of contemporary issues in a fictional, often dystopian setting. From the fear of nuclear war exemplified in early films like "Mad Max" in the late 1970s and 1980s, to more recent concerns about climate change and pandemics in movies like "Snowpiercer" and "Contagion," the genre has continually adapted to reflect the times. This question invites an exploration of how cinema has historically encapsulated and evolved with global concerns, and whether current films are pushing new boundaries or revisiting old ones amidst today’s challenges.