Climate change: A small green rock's warning about our future
BBC News image copyrightChristine Siddoway image captionAn extraordinary journey: The atomic make-up of small crystals in the rock reveals its origin It's an unassuming rock, greenish in colour, and just over 4cm in its longest dimension. And yet this little piece of sandstone holds important clues to all our futures. It was recovered from muds in the deep ocean, far off the coast of modern-day West Antarctica. The scientists who found it say it shouldn't really have been there. It's what's called a dropstone, a piece of ice-rafted debris. It was scraped off the White Continent by a glacier...
Source: bbc.co.uk