"Maize from Central America was grown in southern Europe and Africa
and China. Potatoes from South America were grown in the UK, and all the
way through Europe to China. Species went the other way: wheat came to
North America and sugar came to South America - a real mixing of species
around the world.
We saw these species jump continents, which is a
geologically unprecedented impact, setting Earth off on a new
evolutionary trajectory."
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