It is real, but some leftists use it to promote alarmism and encourage people to support agendas that increase the government control over everything.
For decades there have been people alarming others about the climate, first it was a new ice age that never happened, then the ozone hole, now it is that ice is melting, there is always something about the climate that leftists use to alarm everyone. People shouldn't believe these manipulations. The climate is always changing, there is no need to become paranoid about it, much less to give more power to government so they can "fix"it.
Once our resources are depleted and there will be no more clean air to breathe, water to drink or food to eat
Please, there are enough resources. Stop believing that having a productive society and consuming products is bad or unsustainable, it is not. We will be fine. Remember that these ideas about the resources and the climate have been going on for decades, leftist use this tactic again and again to scare people and attack capitalism...
Check these images and their dates