Greenhouse gas (GHG) accounting is key to how investors, consumers, and even regulators understand companies' contributions to climate change, and the efforts companies are making to reduce those contributions. GHG accounting has been around for decades, but the pressure is building for major changes to how the accounting is done, and what claims companies can make with regard to their progress towards net zero. This podcast episode provides a rapid introduction to the world of GHG accounting, setting the stage for future podcast episodes that dig deeper into specific questions and proposals for change.