We are still in an ice age which started about 2.6 million years ago, we just live in a warm period called an interglacial. If you mean “what happens to Earth if there’s another glaciation”? You must look at evidence of the last events.
If a similar event to the last glaciations occurred, ice a mile or more thick could cover up to 30% of the continents, a good proportion of the rest would be tundra suitable for reindeer and their predators. A narrow tropical climatic band would encircle the globe flanked by wide, dry desert areas. The climate for many areas would change, sea level would drop drastically. Areas such as the Java Sea and parts of the South China Sea would be dry land, as would Torres Strait connecting Australia with Papua New Guinea.
This would effect most forms of life living on the continents and some in the oceans.

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