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[[circled]] 3 [[/circled]]

=>  Natural GH "Good"  (Pleasant climate, & one we're all adapted to & have dev [[developed]] agriculture & communities around)

BUT - Now adding extra CO2 & other GHG to air
      Burning fossil fuels (oil, wood, coal) & deforest.

      How much:

[[box]] KEELING [[box]]  Since 1958, been measuring CO2 every day
        [In Spring, plants take in CO2, graph ↓]

[[box]] FROM WHERE [[box]]    Most fossil fuels deforest

[[box[[ ICE CORES [[box]]    What was CO2 like in past?
-  Can answer that!   Scientists have gone to glaciers & ice sheets (snow & ice over thousands of years) [100,000's]
Drill, Core .... Time machine

How does this help?

Ice forms (packs snow), traps bubbles of air

=> Sample & Analyze ancient air
Result =>   Long CO2 record

Much higher today than in last 650 K yrs

=> Add CO2, ↑ GH effect, expect warming