> We know that the Earth has had at least five major ice ages. The first one happened about 2 billion years ago and lasted about 300 million years. The most rec

> We know that the Earth has had at least five major ice ages. The first one happened about 2 billion years ago and lasted about 300 million years. The most recent one started about 2.6 million years ago, and in fact, we are still technically in it. https://www.space.com/ice-ages-on-earth-could-humans-survive https://www.space.com/ice-ages-on-earth-could-humans-survive