EarthOur lust for tastier chocolate has transformed the cocoa tree Ever since we domesticated the cocoa tree over 3000 years ago, we have been breeding them to make tastier chocolate – but in the process we have made them vulnerable ¿ìè¶ÌÊÓÆµ
LifeIt took 2000 years to make seed for America's famous 'corn belt' Maize reached the southern US 4000 years ago, but wasn’t farmed in cooler areas until 2000 years later – because it took that long to develop cool-hardy strains ¿ìè¶ÌÊÓÆµ