Crossword Genius

A period of long-term reduction in the temperature of the Earth's surface and atmosphere (3,3)

Ross

I believe the answer is:

ice age

(Other definitions for ice age that I've seen before include "When glaciers covered a large part of the earth's surface" , "Glaciated period" , "Epoch of glaciers" , "Cold spell (a very long one!)" , "lengthy number?" .)

I've seen this clue in The Independent.
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