Nuclear energy

Definition: - Energy released by nuclear reactions: fission (splitting heavy nuclei like uranium-235 or plutonium-239) or fusion (combining light nuclei like isotopes of hydrogen). Key advantages: - High energy density: far more energy per unit mass than chemical fuels. - Low direct CO2 emissions during operation: helps mitigate climate change compared with coal/gas. - Reliable baseload power: operates continuously independent of weather. Key disadvantages and risks: - Radioactive waste: long-lived high-level waste requires secure long-term management. - Accident potential: rare but severe events (e.g., Chernobyl 1986, Fukushima 2011) with health, environmental, and economic consequences. - Proliferation risk: technology and materials can be diverted to weapons. - High upfront costs and long construction times. Variants and developments: - Light-water reactors (current mainstream). - Advanced designs: small modular reactors (SMRs), Generation IV reactors (e.g., molten salt, fast breeders) aim to improve safety, waste use, and economics. - Nuclear fusion: experimental (e.g., ITER) — promises abundant clean energy but remains not yet commercially realized. Policy and ethical considerations: - Trade-offs between climate goals and safety/proliferation/waste concerns. - Equity: siting, cost, and intergenerational responsibility for waste management. - Regulatory and institutional capacity critical for safe deployment. Further reading: - World Nuclear Association: https://www.world-nuclear.org - IPCC Special Reports on mitigation and pathways including nuclear energy.