Present since the last ice age, most of the world's glaciers are now shrinking or disappearing altogether as the climate gets warmer. 

Records from the last five decades show that on average, spring snow is disappearing earlier in the year than it did in the past. 

Climate scientists discuss what they know about global climate change today, and how they know it.

The Southern Oscillation Index tracks differences in air pressure between the eastern and western sides of the tropical Pacific.

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