We need to reduce the using of cars and other motor machine.Ride bikes to work instead.
Reduce the use of coal and petro,use the solar energy and wind blowing energy and water flowing energy instead.Use the clear energy in daily life.Make recycling use of some source such as use the grass and waste to produce CO and CH4 to burning for energy.To save the energy means less industry and more high technology and biology creation.Sometimes people need to spend their life in a more hard one to prevent the source on the earth from being used up.