Geography 1400F/G Lecture Notes - 350.Org, Naomi Oreskes, Paleoclimatology
27 Jan 2014
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Co2, methane and the heat trapping capacity has gone way up. Above 2c is a dangerous increase in temperature (could cause catastrophic changes in some place of the world). 3-4c warming there will be no glacier left within a hundred years. There is a changing chemistry (ppm and ppb), the molecules in atmosphere of combusted fossil fuels has a unique chemical signature. Climate scientists say humans are force in reshaping physical system of the earth. Ppm has increased by 2 every year since the 70s. Climate change economy = fossil fuel runs society and 4/5 of net energy supply is from fossil fuels (oil, coal then natural gas). Oil makes up a third of fossil fuels used (since it powers almost all modes of transportation and coal is used for electricity. 2007 and in 1990"s there was strong scientific consensus that humans are the cause for the climate change.
