Climate 1 - Climate change (global warming) The issues: 1....

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Climate change (global warming) The issues: 1. Are humans responsible for most of the global temperature rise of the past century or so, or is the increase just a typical fluctuation in global temperature? 2. If most of the temperature rise can be attributed to increases in anthropogenic CO 2 emissions, what are the likely consequences if no action is taken to curb these emissions?
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Evidence and proposals for change What is the evidence? Is it compelling? What is the scientific consensus? Climate models and their predictions Consequences of the predictions Strategies for change Climate change and ozone depletion
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Chemistry we need to learn The Earth’s energy balance - the greenhouse effect The shapes of molecules - valence shell electron pair repulsion (VSEPR) theory Molecular vibrations – how they absorb IR radiation Masses and moles - weighing to count molecules
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The Venetian atmosphere 450 Ο C, 90 (Earth) atm. 96% CO 2 with H 2 SO 4 clouds Without CO 2 , T would be about 100 Ο C Fig. 3.1
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Earth’s atmosphere The Earth is about 33 O C warmer than expected if we consider only the amount of solar energy received and reflected. Trace atmospheric gases, H 2 O and CO 2 , trap infrared radiation that would otherwise be re-emitted into space. This effect is known as the Greenhouse Effect - the mechanism that keeps greenhouses hotter than we might expect.
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The Earth’s energy balance
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Climate 1 - Climate change (global warming) The issues: 1....

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