0 a time in the past when the temperature was very cold and glaciers (= large masses of ice) covered large parts of the earth -- 冰河時代，冰川期，冰期
Many of the principles outlined apply also to earlier ice sheets, so even readers not interested in the last ice age specifically will find much of value.
Secrets of a tropical ice age.
After the last ice age, sea levels rose when the ice melted and many cities and villages were flooded.
We know so little about the weather and the little ice age of the 17th century concluded with a period of exceptionally low solar activity.
We are not in an ice age at the moment and according to the best estimates it will not return for another 4,000 years.
We should not be too frightened of it; otherwise we might have been frozen in the ice age.
I firmly believe that we are entering a new ice age as regards the resources of this country.
The last ice age came incredibly quickly—that is proven geologically—and we are talking about actual time, not geological time.
