Lecture 0205.pptx - Energy and Climate \u2013 Vision for the Future Michael B McElroy [email protected] Feb 5th 2018 In-class thought question As you

Lecture 0205.pptx - Energy and Climate – Vision for the...

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Energy and Climate – Vision for the Future Michael B. McElroy [email protected] Feb 5 th , 2018
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In-class thought question As you cool water, its density increases. For fresh water, the density is a maximum at a temperature of 4 o C. With subsequent cooling to 0 o C, ice would form for example at the surface of a large lake. 1. Is it possible for a large lake to freeze totally from top to bottom? 2. Does salt water freeze at a lower or higher temperature than fresh water?
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Carbon cycle
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US Sectoral breakdown of CO 2 emissions 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 0 1000 2000 3000 4000 5000 6000 7000 Non-Energy Use of Fuels Commercial Residential Industrial Transportation Electricity Generation CO2 emissions (MM CO2)
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0 1000 2000 3000 4000 5000 6000 7000 Total Coal Natural Gas Oil C O 2 e m i s s i o n m i l l i o n t o n s US CO 2 emissions reduction targets 2025 26%-28% reduction 2050 83% reduction
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US CO 2 emissions reduction targets 0 1000 2000 3000 4000 5000 6000 7000 Total transportation Electricity C O 2 e m i s s i o n m i l l i o n t o n s 2025 26%-28% reduction 2050 83% reduction
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China, US and India account for half of global CO 2 emissions
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Trends of CO 2 emissions in major countries
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from Economist
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IEA finds CO2 emissions flat for third straight year even as global economy grew in 2016 - straight-year-even-as-global-economy-grew.html
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CO 2 in 2013 CO 2 from 1970-2013
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Renewable Energy’s Share of Power Generation, 2004–2014
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Perspectives on Earth and Human History
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The Earth is approximately 4.5 billion years old. Life has been a feature of our planet’s history for at least the past 3.5 billion years. Position of continents has changed significantly over earth history. Climate has varied significantly.
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First evidence for glaciation about 2.5 billion years ago. Spectacular series of fluctuations between 750-580 million years before present (BP) On at least four occasions earth was totally frozen over, condition referred to as the Snowball Earth.
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