NPCC Long Island, US

The Environmental Protection Agency (EPA) is the United States government agency that provides regularly updated default emission factors for organisational greenhouse gas reporting in the United States.

The GHG Protocol is the de-facto standard-setting organisation for greenhouse-gas accounting. As well as producing guidance on estimating and categorising emissions, it also provides a set of the most commonly-used emission factors including energy consumption, transportation, waste management, and industrial processes.

Green-e is a certification program in the United States focusing on renewable energy and carbon offset products and services, providing greenhouse gas emission factors for energy sources such as electricity.