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Washington's greenhouse gas inventory

We prepare Washington's Greenhouse Gas Inventory report, which summarizes the amount of greenhouse gas emissions by sector. The inventory helps us identify trends and determine progress toward meeting the greenhouse gas reduction limits set by the Legislature.

Tracking Washington's greenhouse gases

Washington's Legislature enacted a bill in 2008 requiring the reduction of the state's greenhouse gas emissions. The Washington Greenhouse Gas Inventory is one way we're tracking progress. The inventory helps us determine where emissions are coming from, and whether they are increasing or decreasing over time.

Washington's greenhouse gas emissions by sector

The inventory is based on data from a variety of sources, such as the U.S. Environmental Protection Agency and the U.S. Energy Information Administration. We've been publishing the inventory every two years since 2010. Washington State's Greenhouse Gas Inventory looks at greenhouse gas sources by sector including:

  • Electricity
  • Residential/commercial/industrial
  • Transportation
  • Fossil fuel industry
  • Industrial processes
  • Waste management
  • Agriculture

Some key findings from the most recent report are:

  • Washington’s 2013 total greenhouse gas emissions were 94.4 million metric tons (MMT)
  • Washington’s 2013 total greenhouse gas emissions were 6 MMT higher than the 1990 baseline of 88.4 MMT
  • Washington’s greenhouse gas emissions declined by about 2.8 percent from 2010 to 2013; however, 2013 greenhouse gas emissions increased by about 0.8 percent from 2012 levels
  • Compared to the nation, the electricity sector in Washington contributes significantly less emissions due to the availability of hydropower
  • In 2013, Washington’s largest contributors of greenhouse gases were:
    • Transportation sector — 42.8 percent
    • Residential, commercial, and industrial sector — 22 percent
    • Electricity sector — 19 percent

Washington's 1990 greenhouse gas baseline

The inventory compares current greenhouse gas emissions to the 1990 baseline level. Read the Washington State 1990 Greenhouse Gas Emission Inventory for more information.