Write are the principles of Green Chemistry.

The 12 principles of Green Chemistry (Anastas and Warner):

1. Prevention: it is better to prevent waste than to treat or clean it up after it is formed.
2. Atom economy: design syntheses so that as many atoms of the reactants as possible end up in the product.
3. Less hazardous chemical syntheses: use and generate substances of little or no toxicity.
4. Designing safer chemicals: products should do their job while being minimally toxic.
5. Safer solvents and auxiliaries: avoid them where possible, or use harmless ones (water, supercritical CO₂, ionic liquids).
6. Design for energy efficiency: run reactions at ambient temperature and pressure where possible.
7. Use of renewable feedstocks in place of depleting ones.
8. Reduce derivatives: avoid unnecessary blocking/protecting groups.
9. Catalysis: selective catalytic reagents are better than stoichiometric reagents.
10. Design for degradation: products should break down into harmless substances after use.
11. Real-time analysis for pollution prevention: monitor processes in-process to stop hazardous substances forming.
12. Inherently safer chemistry for accident prevention: choose substances that reduce the risk of explosions, fires and releases.