Cyclone Debbie: Experts fear damage to Great Barrier Reef
Access to drinking water around the world - in five infographics
The Cinta Large and the curse of the diamonds
Food trade drains global water sources at 'alarming rates'
Searching for the gem that could lift them out of poverty: emerald mining in Colombia.
Norway is the happiest country on Earth, according to a report. Why Nordic countries are doing so well?
Sea level rise: Miami and Atlantic city fight to stay above water
Hans Rosling: population prophet: Five final thoughts
Cape Verde in pictures: Living with volcanoes
New demands on Antarctica threaten its future as a haven for climate change science research
Amazon jungle faces death spiral of drought and deforestation, warns scientists
What happens to an economy when a country has an unexpected influx of tourists? Iceland offers lessons about impact on cities, environment and food supply