“Green computing” is a term that was born in 1992, and that seeks to reduce the environmental impact of digital activities. In this talk, we are going to see what green computing is, and what this area of computer science studies, with some examples of data center improvements. We are also going to know what we can do in our day to day about it, and an introduction to green programming (or ecological coding) with python. Technology has a very high potential to help the environment. The objective of this talk is that we all know about it! We will also learn how to know how green our code is with python. (There are no prerequisites. This talk is for all level audiences).