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This paper addresses the GHG emissions from oil and gas extraction, production and combustion and other emissions sources in Libya. In general, this research deals with the primary energy tracing from well to wheel leading to inventor of pollutants emitted through this path. This study presents the first work conducted in the estimation of costs of the environmental damages caused by GHG emissions from Libyans activities, we involved not only the energy or industrial facilities but also the waste and livestock in this process. For Libyan market, we adopted a cost of CO 2 e is 44 LD/ton CO 2 e (which equivalents to 32 US$ or 29 €), the present study reveals that the prices of all fusel fuel must be increased by 79%, 138%, 19% and 80% for Gasoline, Diesel, Air-jet fuel and LPG respectively, and by 8%, 143%, 6%, 3% and 14% for air traveling tickets, MWh of electricity, ton of steel, ton of cement, kg of red meat and ton of garbage, respectively. The total revenue as a result of the implementation of carbon tax is 4.4 billion LD which equivalent to 10% of the Libyan GDP in 2015. The followed procedure enables to investigate the effect of each type of energy, production or service on the environment individually. This research paved the road for more intensive researches to account all pollutants in the social-economical-environmental system.

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Productivity is a very important element in the estimation process in construction management. The objective of this research is to identify and analyze the factors which affect labor productivity in construction projects. In this research, 42 effective factors were collected from site survey, interview with engineers and experts, and previous research in the Arab world. These factors are grouped into Nine categories “Workforce, Leadership, Motivation, Supervisors, Safety, Project, Time, Material, and External”. A survey questionnaire of 70 respondents was distributed among different experts. A statistical analysis was done using SPSS and EXCEL packages. The Relative Importance Index was used to find out the most significant factors affecting the labor productivity in construction sites. The results accomplished from the survey revealed that the major factors negatively affect the labor productivity (ranked from the worst factor with Relative Importance Index values, respectively) namely, Availability Material (88.571%), Climate status “Weather” (88%), Religious occasions (86.29%), Number of working groups (86%), Ganger experience (85.714%), Workforce surveillance (84.857%), Ganger Age (84%), working at height (82%), Drawings and specifications alteration during execution (81.69%), and Sequence of floor (80.571%). Based upon these findings, this can help the construction professionals to improve the productivity and project performance in Iraq.