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Climate Change

Understanding Greenhouse Gas (GHG) Emissions

Washington has a number of programs designed to help us better understand the sources of greenhouse gas emissions in the state. These programs help the state design policies to reduce greenhouse gas emissions and track our progress towards meeting the state’s statutory greenhouse gas reduction limits.

Washington State GHG Emissions Inventory

The state’s greenhouse gas inventory estimates Washington’s anthropogenic GHG emissions for the period from 1990 to 2010. GHG emissions estimates were developed using a set of generally-accepted principles and guidelines for state GHG emission inventories, with adjustments for Washington-specific data and context, as appropriate. The most recent inventory was published in December, 2012. The inventory will be updated every two years as required by state law.
> See more about Washington State GHG Emissions Inventory.

Ecology’s Mandatory Reporting

The Department of Ecology adopted Chapter 173-441 WAC – Reporting of Emissions of Greenhouse Gases on December 1, 2010. The rule became effective on January 1, 2011. Reporting requirements begin January 1, 2012. The mandatory greenhouse gas reporting rule applies to:

  1. Facilities that emit at least 10,000 metric tons of greenhouse gases per year in Washington; or
  2. Suppliers of liquid motor vehicle fuel, special fuel, or aircraft fuel that supply products equivalent to at least 10,000 metric tons of carbon dioxide per year in Washington.
> See more about Ecology’s Mandatory Reporting.

EPA Mandatory Reporting Rules

EPA has issued the Mandatory Reporting of Greenhouse Gases Rule. The rule requires reporting of greenhouse gas (GHG) emissions from large sources and suppliers in the United States, and is intended to collect accurate and timely emissions data to inform future policy decisions. The Department of Ecology will receive greenhouse gas emissions information from facilities in Washington that report to EPA.
> See more about EPA Mandatory Reporting Rules.

The Climate Registry

The Climate Registry is a nonprofit collaboration among North American states, provinces, territories and Native Sovereign Nations that sets consistent and transparent standards to calculate, verify and publicly report greenhouse gas emissions into a single registry.
> See more about The Climate Registry.