How are glaciers helpful in climate research?

Question

How are glaciers helpful in climate research?

Answer 1

They can be used to for ice core samples to determine the earth's climate record. They are also considered a demonstration of the "extreme" of climate change for a number of reasons, as the temperature changes at the poles are more extreme than those closer to the equator.

Answer 2

By drilling cores out of the ice we can find out about climatic conditions in the past .

Also many things are frozen in the ice that give information.

Now with a lot of glaziers melting many things are revealed ,that other wise would have remained hidden.