Climatologists know that the measure of the world's ice, in all its many dimensions and forms, is a measure of current conditions as well as of those frozen over time. These pages present a summary of cryospheric and related indicators of global climate trends including: temperature change over the past century, trends in hemispheric snow extent, trends in hemispheric sea ice extent, glacier melt, and changes in sea level. Also included is a snapshot of current permafrost conditions. Links to current news releases and journal articles, a glossary, and reference list are also provided.
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