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design (investigating (market research, focus groups, product analysis,…

- - - - coal
      - oil
      - natural gases
      - often harmful and will run out
    - - water
      - wind
      - solar
      - often clean and will not run out
    - - due to the commodity and efficiency of fossil fuels, alot of greenhouse gasses are emitted, holding in more of the suns light and heating up the earth.
  - - - treds also vary depending on country
  - - - speed up both design and manufacture of a product
- - - - reverse
      - parallel motion push/pull
      - bell crank
      - crank and slider
      - treadle