This is the Washington State Department of Transportation's (WSDOT's) first greenhouse gas (GHG) emission inventory. This inventory reports greenhouse gas emissions released through agency activities in 2007 and was prepared to help the agency better understand its emissions.
This inventory includes only emissions released by the agency and does not include emissions released by the public traveling on the state highway system. Those emissions are captured in the Washington State Greenhouse Gas Inventory prepared by the Washington State Department of Ecology.
The 2008 Washington State Legislature passed climate change legislation that included mandatory greenhouse gas reporting requirements (RCW 70.94.151). WSDOT emissions are above the threshold, and reporting of emissions will be required. These reporting requirements take effect with 2009 emissions to be reported in 2010. This inventory is the agency's first step in establishing the internal processes needed to meet upcoming reporting requirements.
The inventory follows The Climate Registry's General Reporting Protocol to the extent feasible, and includes greenhouse gas emissions from the ferry system, the highway system (traffic services), agency buildings, and the agency's vehicle fleet. However, rather than basing the inventory on actual utility use, as required by The Climate Registry, utility use was estimated from utility payment information due to the large number of accounts and difficulty consolidating the data.