["Business Strategy and the Environment, Volume 35, Issue 4, Page 6111-6133, May 2026. ", "\nABSTRACT\nCorporate sustainability efforts increasingly emphasize Scope 3 emissions due to their substantial share of total corporate carbon footprints. However, reporting these emissions remains inconsistent, limiting transparency and comparability across firms. This study examines the role of carbon footprint accounting (especially Scope 3 emissions accounting) in shaping corporate sustainability outcomes among S&P 500 technology companies, focusing on how firms measure, disclose, and integrate these emissions into their environmental strategies. Using an empirical analysis of corporate sustainability reports and Environmental, Social, and Governance (ESG) performance data, this study investigates whether comprehensive Scope 3 accounting enhances corporate environmental performance. Findings indicate that firms adopting standardized Scope 3 reporting practices demonstrate improved sustainability integration and stronger ESG performance. However, methodological inconsistencies and voluntary disclosure limitations highlight the need for policy interventions and standardized adoption. This study contributes to the growing literature on carbon accounting by providing empirical insights into Scope 3 emissions disclosure and its implications for corporate sustainability. The findings inform regulatory discussions on mandatory emissions reporting and offer practical recommendations for enhancing transparency in corporate climate strategies.\n"]