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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