**4. Green house gas emission**

Green house gas emission is because of six potential gases. Green house gas emission in Oman during 2000's was around 30 million metric tons [2]. Refrigerant leakage can be a small quantity, but it can be a considerable source of greenhouse


#### **Table 3.** *Sources and properties of greenhouse gases.*

gas emission. The below **Table 3** show the common sources and their properties which are responsible for the greenhouse gas emission.
