Technology is emerging day by day and also the usage of software too in all sorts of fields along the globe. The primary concern in the world now is pollution due to natural disasters and also by the man made inventions for living modern life in society. During usage the carbon emitted from these devices will have higher impact on the overall pollution of the world .So we indeed have to find a solution to minimize the co2 emission from these devices by implementing sustainability in every activities of software development process by applying different JIT green techniques in it. In this paper the section one introduces what is need of green software engineering and its best practices, the section two introduces best practices for sustainable software and energy efficient framework of software ,the section three describes green implementation of different software process methodologies and the final section will show the improvements after implementing green techniques in life cycle.