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Abstract
CO2 emissions from burning fossil fuels have been identified as the major contributor to the increase in atmospheric CO2 levels that can potentially lead to global climate changes. In this work, an easy-to-use predictive tool which is simpler than existing approaches, less complicated with fewer computations, is formulated to arrive at an appropriate estimation of the water content of carbon dioxide-rich phase. The new developed method works for pressures ranging from 5 to 70 MPa (which covers the pressure that is widely considered in CO2 sequestration) and temperatures from 20 to 75°C. Comparison of predicted results with the reliable experimental data indicated excellent agreement with the average absolute deviations being less than 1.5%. This simple-to-use predictive tool can be of immense practical value for the environmental engineers and scientists to have a quick check on the water content of carbon dioxide-rich phase at various temperatures and pressures without performing any tedious experimental measurements. The proposed method is superior owing to its accuracy and clear numerical background, wherein the relevant coefficients can be retuned quickly for various cases. In particular, personnel dealing with regulatory bodies of greenhouse gas control and process industries would find the proposed approach to be user friendly involving transparent calculations with no complex expressions.

1. Introduction
The 20th century has seen the rapid increase of population and explosive growth in energy consumption. As more countries becoming industrialized, it is expected that more energy will be consumed in 21st century [1]. Climate change is now widely recognised as one of the most severe environmental threats to humankind and natural ecosystems [2]. Increasing atmospheric concentrations of CO2 are likely to have significant impacts on plant production and through this on livestock production and resource sustainability [3]. There has been a serious concern about global warming caused by the emission of carbon dioxide (CO2) from various sources. Current focus across the world is centered on CCS (Carbon Capture and Storage) technology, and trial operations are carried out in several places [4].