GEOL 106 Lecture Notes - Lecture 3: Sustainable Development, Resource Consumption, Wced
9 Feb 2015
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Chapter 1: pg 2-11 (1. 1-1. 3) / 19-27 (1. 5-1. 7) (2nd canadian edition) 1950s: measure it directly day-after-day -> we"ve only been doing this since the 1950s . Antarctic and greenland glaciers: this takes us back to over 400,000 years ago. Looking back in the past ice sheet: antarctic ice sheet look at the ice layers, look at the ice itself when the snow falls, it traps little bubbles of air. Put the piece of ice in a machine and then crush it measure the amount of gas released from the piece of ice: ice bubble measure of co2 (co2 ppm vs year) Levels of co2 around 280 ppm until the industrial revolution. After the industrial revolution, the co2 levels increased significantly. Shows the direct impact of humans on the earth. 2 main differences: scale in the past, it was more local, less global. The first of the cfcs chlorofluorocarbons.
