In 1988, the environment was a top public concern, scientists spoke out and politicians said the right things. Global warming was a pressing and present issue. Now, 25 years later, carbon dioxide emissions continue to rise, and we're already seeing the consequences -- more extreme weather events, melting glaciers and Arctic ice, rising sea levels, reduced water flows in rivers and climate-related illness and death, among others. The sooner we act, the easier it will be to overcome these difficult challenges. Every year that we stall makes it more costly and challenging, with increasing negative impacts.