Sustainable design...a wow idea

1.My understanding of the term ‘sustainable design’ is design that do not destroy the environment and try to use renewable like bio mass.
2.Sustainable design can be incorporated for example in design of buildings so we can use less electricity. We can also use solar energy or wind energy as energy source or we can use natural light to light up the house.
3.He wants to help the 1.6 billion people who don;t have access to electricity to have low cost refrigeration and he wants to stop the spread of disease.
4.This contraption can allow people to have access to low cost refrigeration and to save earth’s natural resources.