what is the most environmentally friendly machine

Question: what is the most environmentally friendly machine
- Keywords:
  environment
Asked by away021ace to Olga, Madhumidha, Connor, Canice, Aruna, Anthony on 11 Mar 2020.
- Aruna Chandrasekar answered on 11 Mar 2020:
  
  LED lights, heat pumps are few of the recent inventions taht are very environmentally friendly.
- Anthony Newell answered on 11 Mar 2020:
  
  Wind turbines and other renewable energy machines are very environmentally friendly because we don’t need to burn fossil fuels to generate energy with them.
- Connor McGookin answered on 12 Mar 2020:
  
  A recycled wind turbine made from pieces of scrap metal or junk – https://www.youtube.com/watch?v=arD374MFk4w

Question: what is the most environmentally friendly machine