Scientists are divided on whether snow leopards are still endangered species, a BBC investigation finds.
The previously-protected area is bigger than Denmark and is thought to be rich in gold.
Up to 60 million Pakistanis are at risk from the deadly chemical, according to a new water analysis.
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Galapagos photography competition 2017
Astronomy photo of the year shortlist
Field crickets return from brink of extinction
Supersonic car is set for low-speed runs
10 years of Galaxy Zoo, a citizen science phenomenon
Programmes, video and downloads: Solutions to air pollution from across the world