Phase 2I: L4 chapters (sections 9-13), ~62.8k words#7
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Completes L4 depth extension for sections 9-13 following Phase 2H L3 bridges. Each chapter written at textbook density (~2,500-3,500 words) with <\!-- Evidence Tier: Textbook --> and honoring exact Next: [L4 — X] pointers established in Phase 2H. Section 9 (Earth Systems): Climate Impacts & Adaptation, Geohazards & Resources, Ocean Resources & Impacts, Regional Development, Water Resource Management. Section 10 (Material World): Advanced Materials, Automation & Digital Manufacturing, Agricultural Biotechnology, Decarbonization Pathways, Mobility Futures. Section 11 (Applied Sciences): Medical Specialties & Emerging Therapies, Global Health & Pandemic Preparedness, International & Comparative Law, Learning Science & Higher Education. Section 12 (Human Life): Homeostasis & Aging, Adolescence, Gender in Society (with SCOPE NOTE continuing L2/L3 sex/gender discipline), Meaning & Philosophy of Death. Section 13 (Engineering): Machine Design & Manufacturing, Electronics & Signal Processing, Urban Planning & Sustainable Cities, Aviation Safety & Air Traffic, Specialty Chemicals & Biotechnology. All chapters close with a Level 5 transition pointer (deferred). Co-Authored-By: Zhuge <z@2lab.ai>
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| <!-- Evidence Tier: Textbook --> | |||
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The front-matter marks this chapter as Textbook, but this HA’s contract defines L4-L7 as Cross-disciplinary (see HA_gender_sexuality_Index.md header/table), and the chapter itself explicitly treats contested social and policy questions. Keeping Textbook here will cause tier-based consumers (including translation/review workflows that preserve Evidence Tier markers) to misclassify debated claims as settled, which undermines the repo’s tier-discipline rules.
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Summary
Next: [L4 — X]pointer committed in Phase 2H L3 bridgesCoverage
Section 9 — Earth Systems: Climate Impacts & Adaptation, Geohazards & Resources, Ocean Resources & Impacts, Regional Development, Water Resource Management
Section 10 — Material World: Advanced Materials, Automation & Digital Manufacturing, Agricultural Biotechnology & Future of Food, Decarbonization Pathways, Mobility Futures
Section 11 — Applied Sciences: Medical Specialties & Emerging Therapies, Global Health & Pandemic Preparedness, International & Comparative Law, Learning Science & Higher Education
Section 12 — Human Life: Homeostasis & Aging, Adolescence, Gender in Society (SCOPE), Meaning & Philosophy of Death
Section 13 — Engineering: Machine Design & Manufacturing, Electronics & Signal Processing, Urban Planning & Sustainable Cities, Aviation Safety & Air Traffic, Specialty Chemicals & Biotechnology
Approach notes
Test plan
Co-Authored-By: Zhuge z@2lab.ai