Ice ages have always arrived in cycles to earth and we are currently living in one that started two and a half million years ago! For reference, dinosaurs lived 250 – 60 million years ago, so there were plenty of ice ages between then and now.
But even during an ice age, temperature goes up and down and we are currently in an “up” phase, which is called interglacial. Probably the next “cool” period is in 10,000 years or so.
If you can’t wait that long, Ice Age 6 is going to be shown in the cinemas in July this year (: