The trend towards protecting the environment from the negative impact of carbon emissions from buildings andpreserving resources led to the issuance of many systems for assessing sustainability of building,many of them at the international level and others at the regional and local levels, but when addressing the study and audit of those systems,Itis foundfind that most of them make the criterion for reducing carbon emissions sub-points included in the context of other key elements of the evaluation as a sub-assessment point,Although it represents an important goal for the vision of sustainable development in general and treatment of environmental changes in particular,Therefore the research will discuss the negative role of buildings on the environment, and present And an analysis of the assessment systems for sustainable buildings andtheir main assessment elements, and then analysis and comparison between them to extract carbon emissions assessment pointsandto know if any of them can give an integrated system for evaluating emissions of carbon as a basic criterion for evaluation.The research concludes that the Australian system GREEN STAR can be applied as an indicator to assess emissions in buildings, and as a comprehensive evaluation system for all the basic elements ofthe basic development goals clearly.