Would you believe someone who says we are living in an ice age? You should. Ice ages can last many thousands of years. An ice age consists of both cold periods (glacials), marked by the widespread advance of glaciers, followed by warm periods (interglacials), when glaciers retreat. We living in an interglacial period. The last glacial period ended about 12,000 years ago.
In that glacial period, mountain ice caps and sea ice grew. Thick ice sheets extened from the north polar region into Greenland, Russia and northern Eurasia, and covered Canada and USA.