GPHY 314 Lecture Notes - Lecture 16: Methane Emissions, Oxygen-18
31 Oct 2017
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Week 6 lecture 1: 10,000 -12,000 years first evidence of human interference. Historical climate: coming from africa there were strong summer monsoons, dating was very sparse. Historical climate changes: highest data resolution, 3. 6myrs first evidence of walking on 2 legs looking more like chimpanzees, 2. 5 change in diet (meat eating) jaw more like what we have today. In about 4myrs we tripled the size of our brain. Historical climate change 12,000yrs: social (communication) major evolutionary skill. Impact of summer monsoons led with the long decreasing trend. Weaker summer monsoon = less rain coming in summer. All the conditions lead to drier conditions and adaptation. Unconvincing hypothesis: almost impossible to match due to lack of well-data evidence and sparse cannot say if climate impacted humans environmental records. Impact of climate on early farming & civilizations. Within 1,000yrs villages came into existence increase in communication. 5-4. 2kyrs first evidence that climate affected humans: weaker monsoons = drier = increase in population stress.
