Nature World: It is generally accepted that climate change led to the extinction of the mammoth and other large mammals following the last Ice Age, but an international team of researchers behind a new report in the journal Nature claims to have found the smoking gun that pinpoints which of climate change's myriad effects led to the mass extinction of large mammals. By analyzing sediment samples from more than 10,000 years ago and the gut contents of permafrozen woolly rhinos, mammoths and other extinct Ice Age...