Mammoths and sabertooth cats are but two icons of an assemblage of large animals, or megafauna, that disappeared between roughly 50,000 to 12,000 years ago. As with all mass extinctions, several explanations have been put forward, but one man and his idea take centre stage in these discussions: Paul S. Martin’s overkill hypothesis. In End of the Megafauna, palaeomammalogist Ross D.E. MacPhee carefully scrutinises this idea, weighs up the arguments for and against, and explains its enduring allure. To quote Huxley, is this another example of “the slaying of a beautiful hypothesis by an ugly fact”?
Human civilisation is hungry for many resources, and I feel that there is a general awareness that we are taking more than the planet can provide. Deforestation, overfishing, fossil fuel exploitation – I’d like to think these are all familiar concepts. But who knew that we have a sand crisis looming in our near future? Journalist Vince Beiser has written a hard-hitting reportage that convinces that, despite its ubiquity, even humble grains of sand are a finite resource.