Abstract
It has been put in evidence that 85 percent of the energy consumed by humans comes from fossil fuels. This statement pointed out one of the most important problems currently faced by humans. The generation of energy depends on the use of fossil fuels. The problem which appears is that these fuels cannot be used longer in this way. Indeed, fossil-fuels are running out and it will take millions of years to completely restore the fossil fuels that we have used in just a few thousand. The problem can be explained by the fact that fossil fuels are non-renewable sources of energy. The concept of sustainable development appeared at the end of the 1980s and offered a new vision of how governments, companies and people have to think in terms of development. The emergence of this new concept is truly a revolution. It starts from the Principe that economic development can no longer continue in the same way, that is to say without taking into account its consequences. The primary objective of this concept is to make people, companies and also governments aware that thinking today about what tomorrow will be is something essential. Around 20 years have passed since the emergence of this concept and it is now time to evaluate the results.
