Lesson-specific diagram for Principles and metrics of green chemistry. It visualizes the reasoning sequence tied to $\text{prevention}+\text{atom economy}+\text{hazard}+\text{energy}+\text{renewability}$. Text alternative: Green chemistry redesigns products and processes to prevent hazards and waste rather than relying only on end-of-pipe treatment. Choose a representation that matches the chemical scale and evidence; do not infer more precision or mechanism than the data support.