The concept of green economy has received significant international attention over the past few years as a tool to address the 2008 financial crisis. Governments today are seeking effective ways to lead their nations out of the crisis and the green economy (in its various forms) has been proposed as a means for catalyzing renewed national policy development and international cooperation and support for sustainable development. The aim of this article is to define and highlight the importance of the green (blue) economy and compare it with the so-called greed economy. This article is divided into different sections: after a brief introduction is a systematic literature review; the second section is about sustainable development and the green economy concept; the third is about the green economy and blue economy concept; and the fourth compares greed economy to green (blue) economy. Finally, the author will draw conclusions.