The Environment Game |
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activities agriculture amino acids artificial automation become big science biological brain Calories carbon dioxide cent century Chapter chemical chemical elements chlorophyll climate communities complex systems crops cultivation diet disease Earth economic effects efficient elements engineering environment game envisage example existing farmer farming fertilizers food supplies growing human hunter hunting hydrogen idea important increase industry invention irrigation knowledge land least living machines means ment methods million modern molecules nations natural Neolithic nitrogen nuclear nuclear fusion oceans organisms oxygen Palaeolithic pests photosynthesis plants and animals population population density possible practical present present-day programme protein purposes raw materials reactions reason requirements rewards scientific scientists simple social soil solar source of energy space species square metre square miles sunlight synthesis technical techniques thorium tion town under-developed countries uranium wealth wilderness zero-sum game