Scientists scale peaks and study plants to understand the impact of warming
Amazon research that has withstood thieves and arsonists now faces its greatest challenge
Geographer Christopher Burn explains why permafrost is thawing
Down Under's unofficial capital of food and drink
A lobsterman in Maine talks about the lure of working on the water
How the Hope Diamond's mysterious phosphorescence led to "fingerprinting" blue diamonds
Take a look back at the 50th anniversary of his ascent of Mount Everest
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