Energy and food.
D000383:Agriculture; D003906:Developing Countries; D004044:Dietary Proteins; D004734:Energy Metabolism; D005396:Fish Products; D005523:Food Supply; D005579:Fossil Fuels; D006801:Humans; D008460:Meat; D010940:Plant Proteins; D011156:Population Density; D011891:Rain; D013472:Sunlight; D013672:Technology; D014937:Work
D004044:Dietary Proteins; D005579:Fossil Fuels; D010940:Plant Proteins