Bio 3400 1nd Edition Lecture 34 Outline of Last Lecture I Species extinction II Problems with small population size III Biodiversity IV Types of human impacts on species V Conservation Outline of Current Lecture I Scientific terminology II Climate change fact and theory III Factors influencing climate IV The carbon cycle and atmospheric CO2 Current Lecture I Scientific Terminology a Fact an objective and verifiable observation b Hypothesis educated guess c Theory law an explanation of a natural phenomenon based on a wealth of welldocumented evidence explain and interpret facts II Climate change fact and theory a Facts i The climate is warming evidence atmosphere hydrosphere cryosphere lithosphere biosphere ii Human activities increase atmospheric CO2 CO2 tends to stay in the atmosphere b Theory i How and why the climate is warming 1 Human activities increased CO2 emissions are causing climate change c Hypothesis theory compute the consequences of theory compare to experimentation of observation of the natural world III Factors influencing climate a Solar radiation b Albedo c Atmosphere i Greenhouse gases ii Video candle flame and CO2 These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute IV V 1 CO2 traps heat iii Is global warming due to the depletion of the ozone layer 1 Depletion of ozone layer can t trap heat earth would get colder The Carbon cycle and atmospheric CO2 a What drives the fluctuations in atmospheric CO2 ppm over millions of years b Feedback loops and climate i Positive feedback 1 Warming temps release of methane clathrate deposits in the ocean ii Negative feedback 1 Warming temps rock weathering sequesters CO2 2 Stabilizing Theories a Climate change is due to random chance null b Climate change is due to natural forcings c Climate change is due to anthropogenic forcings
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