A new IPCC report has called for radical changes in food production to avoid catastrophic climate change. Rice-fish farming and mixed crops could help.
No records of the size of Native American populations before 1492 and the arrival of Europeans survive. A new study has found answers.
How did civilization emerge from small groups of hunter-gatherers? Some archaeologists focus on cooperation as the vital ingredient – and find evidence for it in the form of feast-related artifacts.