Concrete is the most widely used building material and thereby it contributes to the growing cement demand in constructions. Climate changes due to global warming are becoming an important issue since the cement industry is responsible for about 6% of the total amount of carbon dioxide emissions world-wide. Therefore researchers are seeking sustainable alternatives to solve this problem. The large amount of fly ash can create new opportunities to use this waste as a substitute for ordinary Portland cement in concrete production. Binders could be also produced by a reaction between an alkaline liquid and materials containing reactive alumina and silicate or waste materials such as slag or/and fly ash. These binders are called Geopolymers and could be the new, alternative green building material in concrete production. The present paper is going to explore: an extended state of the art on the specifications and use of fly ash based Geopolymer concrete and its environmental impact, the mixture proportions manufacturing process, and last but not least the long-term properties of Fly Ash Based Geopolymer Concrete.