ACR has recently updated its Methodology for the Quantification, Monitoring, Reporting and Verification of Greenhouse Gas (GHG) Emission Reductions from the Destruction of Ozone Depleting Substances (ODS) and High-Global Warming Potential (GWP) Foam for ODS projects in the U.S. The new methodology (v2.0) changes some of the default parameters used in establishing the emission reduction (ER) claims of ODS destruction projects. In this blog, we describe the two major changes enacted under v2.0 of the ACR methodology, the context behind these changes and the impact they ultimately produce on the GHG integrity of these projects. Our investigation sheds light on some of the underlying assumptions and uncertainties within the methodologies for ODS destruction.