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
Down Under's unofficial capital of food and drink
A lobsterman in Maine talks about the lure of working on the water
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