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5 - thermal expansion& melting ice Aside from energy...

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02:15 Optimal level of CO 2  is NOT zero Earth has natural mechanisms for regulating CO 2   levels Emissions from humans are interfering w/ that cycle * Scientists specialize on each of these levels, but no holistic view Emissions:      can be mitigated Cycles:      heat entering planet should = heat leaving, but greenhouse gases trap  too much heat Radiation forces Alter climate:  heat lags (seasonal peak in August, daily peak in afternoons).  Climate change has a lag problem – consequences of messing up climate aren’t  immediately seen ( 0.5 °  over last 50 years) Sea level rise Change ecosystems:      reallocate globally to adjust to climate change Affect mankind     Market impacts     : agriculture, forestry, water, energy, coastal: sea expands due to 
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Unformatted text preview: thermal expansion & melting ice Aside from energy, other sectors won’t really be affected Non-market impacts : quality of life (hard to measure damages), ecosystem shits, endangered species (mostly 1 cell organisms), loss of human lives (climate dependent diseases), extreme events (hurricanes, droughts), recreation (skiing, beach) Note: Small fraction of economy affected Double CO 2 = lose 2% of GDP Scientists think things are worse than economists do By 2100 with BAU: -0.5% GDP loss. Why not so bad? Benefits of climate change: early literature only counts damages Adaptation: early lit assumes no change in behavior Growth: early lit assume economy doesn’t change 02:15 02:15...
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