emissions are estimated to be approximately 900 MT of CO 2 e . Most of our reductions in GHG emissions over time as we implement the Sustainability Plan will come from our two airports .
Scope 1 and Scope 2 Greenhouse Gas Emissions
Based on the results of the GHG inventory , as seen in Figure 8 below , Scope 2 emissions represent 67 % of total Scope 1 and Scope 2 emissions at each of Reagan National , Dulles International , and the DTR . As noted above , Scope 2 refers to the emissions associated primarily with purchased electricity .
GHG Emissions by Source ( Metric Tons )
Figure 8 : GHG emissions by category
When we drill down into the sources of these emissions , as seen below in Figure 9 , in addition to the aforementioned purchased electricity which represents 67 % of the total at each facility , on-site natural gas use is responsible for 20 % of emissions at Dulles International and 23 % at Reagan National ( and zero percent at the DTR ). Finally , diesel emissions range from 7 – 11 % of total Scope 1 and Scope 2 amounts depending on the facility . Our CNG , gasoline , and propane emissions are very modest in comparison to other sources , which is why they are not clearly visible in the figure below .
53