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Topic 6 HUMAN POPULATION GROWTH AND VULNERABILITY TO ENVIRONMENTAL CHANGE.Topic 6HUMAN POPULATION GROWTH AND VULNERABILITY TO ENVIRONMENTAL CHANGE.IntroductionHuman Food: from foraging to fossil fuelThe hominids of which Homo sapiens is the scale surviving species split from other primates lineage more than 4 million years ago. Present evidence indicates that this divergence occurred in Eastern Africa, with the first hominids being omnivourous savanna dweller who hunted and scavenged animal, prey and gathered plant food.This existence as one species among many mammalian foragers, persisted for most of human history with agriculture arising not much more than 10,000 years ago.The change to agriculture was not an abrupt transition the first steps probably being the tendency of particular plants to ensure their continuing productivity and the taming of animals.Domestication carries this process much further because it involves gaining control of reproduction of the organisms involved. This in turn allows selective breeding which has produced the domestic species that we have today.Agriculture not only involves the exercise of evolutionary control over the species selected but also the creation of special environment which to keep them. The resulting combination of people, domestic plants/animals and their environment are called agroecosystems to distinguish them from natural ecosystems in which people play no special part.Humans have used different types of agroec

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