This study presents a comprehensive analytical examination of corporate environmental responsibility and sustainability as it has evolved from a peripheral compliance obligation into a central strategic imperative for organizations worldwide. Drawing on publicly available research papers, regulatory documents, industry reports, and institutional data from 2024 to 2026, this paper systematically investigates five interconnected dimensions: (1) the global regulatory landscape encompassing the EU Corporate Sustainability Reporting Directive (CSRD), SEC Climate Disclosure Rules, ISSB Standards (IFRS S1 and S2), and California’s climate disclosure laws (SB 253/SB 261); (2) corporate climate target-setting and decarbonization progress, with particular emphasis on the Science Based Targets initiative (SBTi) reaching 9,764 validated targets by end-2025 and the persistent credibility gap wherein fewer than 7% of net-zero commitments meet basic integrity criteria; (3) energy management, water stewardship, and circular economy performance, including RE100 progress, corporate PPA market dynamics, and the stalled UN Global Plastics Treaty; (4) ESG financial integration evidenced by $30.3 trillion in sustainable AUM, green bond issuance exceeding $1 trillion annually, 3,099 climate litigation cases across 55 jurisdictions, and $4-7 trillion in stranded asset exposure; and (5) emerging trends including the Taskforce on Nature-related Financial Disclosures (TNFD), AI-driven environmental management systems, mandatory transition plans under the UK Transition Plan Taskforce framework, and the paradoxical coexistence of anti-ESG political backlash with intensifying greenwashing enforcement. The analysis reveals a fundamental transformation from voluntary corporate environmentalism to mandatory, auditable sustainability governance, while identifying critical implementation gaps between ambition and credible action across all dimensions examined.