| Replaced | Fossil fuels |
| Discovered | 1960s and 1970s |
| Controversies | Nuclear safety • disarmament |
| Economic changes | Economic growth • energy-abundant society |
| Geopolitical impact | Reduced tensions over energy supply |
| Environmental impact | Drop in greenhouse gas emissions • Minimal nuclear waste |
| Technological changes | Fusion power technology • 'Radical' shifts in technology |
| Dominant energy source | Early 21st century |
