In the past 540 million years, the Earth has endured five mass extinction events, each involving processes that upended the normal cycling of carbon through the atmosphere and oceans. Read full report.
Nora Rothrock couldn't believe her eyes as she watched the tan-coloured beast from her window in Hampstead, north London, last week. She took a snap of the big cat and send it to the Natural History Museum, where experts are now trying to work out what kind of animal it is. Read full report.