Gray hair, memory loss, wrinkles and brittle bones, sooner or later, each of us gets old (if we’re lucky). Yet scientists tell us that there is no evolutionary reason for us to age. So, why do we?

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In this graphic, the red regions are areas where  temperatures have increased the most during the last 50 years, particularly in West Antarctica, The dark blue regions have had a lesser degree of warming. Temperature changes are measured in degrees Celsius. 
The collapse of large parts of the ice sheet in West Antarctica appears to have begun and is almost certainly unstoppable, with global warming accelerating the pace of the disintegration, two groups of scientists reported Monday.

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