NATS 1840 Lecture Notes - Lecture 19: Clive Ponting, Homo Habilis, Homo Erectus
25 Nov 2017
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6. albedo = reflected power / incident power = 0. 25, or 25% The earth"s human population grew from 1 to 7 billion in about 200 years. using this information, roughly estimate the average growth rate during that same period of time . Rule of 70 (doubling time): 1-7 billion = 3 times, then 200 years / 3, doubling time is about 66 years, r= 70/66 = . The distant past - years ago years ago in africa, europe and asia tools and mastered fire, so it is important to note that this was passed down to us naturally around them plus a small amount of hunting. First hominids (species that we recognize as being proto-humans) appear 5-10 million. Homo habilis (handyman) and homo erectus (first to walk upright) appear 2 million. Homo sapiens appear 120,000 years ago predecessors have already developed. For 100,000 years humans live in small hunter-gatherer groups, subsisting on what grows.
