How the world's 6.6 billion people threaten the health of the ecosystem
What mangroves give the world and why we can't afford to lose them
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
Electronic books may soon vie with library cards for space in your pocket
How the Hope Diamond's mysterious phosphorescence led to "fingerprinting" blue diamonds
The latest on the endangered mountain gorillas in war-ravaged Congo
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