Natural archives preserve climate evidence. Ice-core bubbles contain old air; ice isotopes give indirect temperature clues after calibration. Air and ice can differ in age. Some Antarctic records extend at least 800000 years. Rings, coral, sediments and pollen provide other clues. Assessment combines studies; it does not make measurements by vote. Safety: Paper-only archives. No cutting tools, specimens or collection. Stop: Stop at the supplied records. No coring ice or trees, sampling coral, digging sediment, downloads or dating claims.

Materials: Paper; Pencil; Ruler 1. Draw a vertical core with top Younger and bottom Older, noting undisturbed sequence assumed. Copy three illustrative layers: A shallow, ice age 1000 years, air age 800 years, CO2 280 ppm, temperature proxy index -1; B middle, ice age 10000, air age 9500, CO2 265, index -3; C deep, ice age 20000, air age 19000, CO2 190, index -6. Mark all values invented. 2. Circle CO2 as an air measurement and underline the proxy index as an indirect clue, not °C. Add a volcanic-marker line between B and C; write that a marker can help align records if dated, not that every dark line has a known age. 3. Copy four archive cards: Tree rings: growth reflects moisture, temperature and other conditions. Ocean sediments: organisms and chemistry. Coral skeletons: growth and water-chemistry clues. Pollen: past plant communities. Explain why combining archives is stronger than relying on one. 4. Compare illustrative model indices A -1, B -2, C -5 with proxy indices -1,-3,-6. Record model-minus-proxy differences. Models apply physical laws. Past-climate testing compares simulations with uncertain reconstructions; agreement on the overall pattern does not prove every detail. 5. Draw an assessment chain: studies and observations → expert synthesis → expert/government review and revision → assessment with confidence and uncertainties. Label IPCC assesses literature; does not run all experiments or models. Done: A core sketch, measurement/proxy distinction, four archive cards, three model comparisons, and assessment chain are complete. Proof: Keep all sheets. Note supplied ages and adult help with reading, subtraction, proxies or review roles. Stop: Stop at the supplied records. No coring ice or trees, sampling coral, digging sediment, downloads or dating claims.