As cloud computing and its usage are in a surge in various industries, making it green is becoming more and more important. Therefore, the goal of this review is to highlight the importance of changing existing cloud computing practices to attain green use of cloud computing to reduce greenhouse gas emissions gases, use less energy, and save money. There are several ways to do it, some of which include scheduling to get maximum efficiency, virtualizing to achieve proportional computing, low cost, and hardware used to produce as much as possible. Other general strategies comprise clusters that produce power utilizing renewable energy controlling power usage and computing. Regardless of the advantages of green cloud computing, there are security issues and networking requirements. The pursuit of novel cloud computing techniques is ongoing for data centers and their industry.