Acknowledgements; Introduction; Part I. Problems: 1. Precautions and paralysis; 2. Behind the precautionary principle; 3. Worst case scenarios; 4. Fear as wildfire; Part II. Solutions: 5. Reconstructing the precautionary principle - and managing fear; 6. Costs and benefits; 7. Democracy, rights, and distribution; 8. Libertarian paternalism with Richard Thaler; 9. Fear and liberty; A concluding note: fear and folly; Index.