Greenhouse gas emissions - Wikipedia

Greenhouse gases - U.S. Energy Information Administration (EIA)

Greenhouse Gases at EPA

GHG inventories - Washington State Department of Ecology

Tools Built on GHG Protocol

More than 60 cities now use “gold-standard” global protocol to report on GHG emissions - C40 Cities

Greenhouse Gas Measurements

GHG Inventory

Natural Gas, Oil Industry Urges EPA to Revise Proposed GHG Reporting Rule - Natural Gas Intelligence

GHG Software: 5 Critical Questions to Ask Your Vendor - Cority

GHG, CO2, CO2e and Carbon: What do all these terms mean?