1. Introduction: The Threshold of a New Climatic Era As the calendar turned to January 2026, the global scientific community and policymakers found themselves navigating a landscape that had fundamentally shifted from the theoretical warnings of the early 21st century to the visceral reality of a planet in flux. The year 2025 concluded not merely as another data point in the relentless upward march of global temperatures but as a definitive marker of a new climatic regime. Cl