BIOL 350 Lecture Notes - Lecture 7: David Attenborough, Paul Erlich, Voluntary Childlessness
18 Oct 2016
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Document Summary
Current world population: about 7. 5 billion now: 2. 5 people per second. Around the turn of the century, so many warning calls about climate change. Then around 10 years ago, people problems came into our awareness, extinction with species, ability to feed the planet, food supply. In 2009, nature films broadcaster sir david attenborough joined population trust, highlighting the problem with population. Annual additions of people ramping up near the great acceleration, but now started slowing down in the 1970"s, around the 1990"s reached the peak, and now actually dropping: how quickly are people dying vs. being born. Usually the biggest problems with growth rate. Developed countries haven"t been changing since the turn of the century. Population size depends on death rate and fertility rate. Less developed countries tend to have a higher fertility rate (# of births per life per woman) A lot of europe, russia, japan has less than the replacement rate.
