The concentration in 2005 exceeds by far the natural

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measurements. The concentration in 2005 exceeds by far the natural range over the last 650,000 years, as determined by ice cores (amazing data!). A huge spike since 1750, roughly the beginning of industrialization. The main source of CO 2 is fossil fuel use. B. Methane. Atmospheric concentration of methane exceeds by far the range over the last 650,000 yrs. Probably due to various agricultural activities (cows) and fossil fuel use. C. Nitrous oxide much the same. (This is “laughing gas,” used formerly by dentists.) VI. The future: how bad will it get? A. 8 models are now available. 1. Temperature slide 1.8 – 4.0º C at end of 21 st century. Map slide shows this, and it includes California. 2. Sea level rise 0.18 – 0.59 over same period (= 7.1 – 23.2 inches). Do not buy seafront property! 3. Precipitation. Varies with locale, of course, rather than showing a uniform trend. slide Increase in high latitudes, especially north and decreases in subtropical areas by as much as 20% by the end of 21 st century. How does that translate to California? California is predicted to dry out even more. Do not buy property in dry, fire-prone areas of California! Phoenix and similar areas will have almost no water and probably be uninhabitable.
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4. In order to stabilize at 450 ppm (about where we are now), emissions must go down 27%, not impossible but unlikely. If we stabilize by 2100, still will get an increase of half a degree by 2200. Sea level will still go up 0.3 -- 0.8 m (12 – 32 inches) by
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