food security and farming

• describe food security

  having enough food to feed a population
• give factors affecting food security

  • increasing birth rate
  • changing diets
  • new pests and pathogens
  • environmental changes
  • cost of agricultural inputs
  • conflicts
• give affects of efficient farming

  less energy used for movement and controlling body temperature
• give methods of efficient farming

  • raised inside sheds and pens
  • high protein diet
• give disadvantages of efficient farming

  • increased spread of disease
  • changed behaviour of livestock
  • ethical objections
• give methods of sustainable fisheries

  • controlling net size
  • fishing quotas