Contents: 

1) Introduction………………………………………………………………2
2) Types of Green Engines………………………………………………….3
3) Construction & Working……..………………………………………….4      
    3.1) Turbocombustion Green Engine…………………………………4      
    3.2) Radial Internal Combustion Wave Rotor………………………..6      
    3.3) Green Engine………………………………………………………7      
    3.4) Internally Radiating Impulse Structure Engine…………………9
4) Advantages……………………………………………………………….12
5) Future…………………………………………………………………….14
6) Conclusion…………………………………………………………..........14
7) References………………………………………………………………..15