This document discusses the evolution of corporate sustainability and greening efforts over time. It outlines the shift from Corporate Greening 1.0 in the 1960s-1990s to Corporate Greening 2.0, driven by factors like climate change policy, activist pressure, and new business opportunities in clean energy. It emphasizes that corporate communicators need to understand trends, engage stakeholders, provide transparency and accountability, and position their company for success in the new sustainable economy.