EnvironmentRanching and farming have eroded almost all the soil in the Alps Grazing livestock and farming over the past 4000 years have rapidly accelerated the rate of soil loss in the Alps, jeopardising the ecosystem and putting the mountains at risk of further erosion 51¶¯Âþ
HumansAncient humans’ extraordinary journey to South America Humans first arrived in South America through a series of extraordinary migrations – and genetic studies now reveal more about how they settled and then split into four distinct groups on the continent 51¶¯Âþ