Before revision:  In this document  we explore the definition of  energy transition, how it is reached,  what are the driven factors to achieve it , and why in the 21st century context we can refer to it as Green energy transition .
After revision:  In this document , we explore the definition of energy transition, how it is reached, what are the driven factors to achieve it , and why in the 21st century context we can refer to it as Green energy transition .