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  • B3b
    • human activities that reduce land available - house building, dumping
    • sudden increase in population- medicine improvements and more efficient farming methods (more food so less hunger)
    • greenhouse gases
      • absorb much of the heat radiated by the earth and re-radiate it in all directions
      • if no greenhouse gases all radiated energy would be lost so the earth would be much colder
    • peat bogs
      • plants in bogs don't fully decay as there is not enough O2, partly rotted plants build up to form peat
      • carbon stored in plants, when big drained decomposition occurs so CO2 is released
      • could use peat free compost to reduce demand for peat to reduce no of bogs drained
    • climate change
      • evidence = data that supports/contradicts a hypothesis
      • hypothesis = a possible explanation for observations
      • data could include temp of sea surface, atmospheric temp, snow and ice covers
    • biogas = methane and carbon dioxide
      • biogas produced using e.g. plant waste and animal dung
      • biogas generators must use few chemical toxins in case the microorganisms get poisoned
    • intensive farming = animals kept close together, indoors and in small pens so they're warm and can't move
      • don't waste energy in movement - transfer of energy is more efficient
      • cheaper food products


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