The global economy remains heavily dependent on finite fossil fuel reserves because coal, oil and natural gas provide concentrated, reliable energy through extensive existing infrastructure. Replacing this system requires major technological, economic and political change.
This is HL-only content in IB ESS subtopic 7.2 Energy sources: uses and management, especially understanding 7.2.8.
The Reasoning
Fossil fuels are non-renewable energy sources formed over geological timescales. Their reserves are finite because consumption is much faster than natural replacement.
Dependence persists through carbon lock-in: transport networks, power stations, factories and supply chains were built around fossil fuels. Using existing assets appears cheaper in the short term than replacing them, despite greenhouse-gas emissions and pollution.
| Factor | How it maintains dependence |
|---|---|
| Energy density | Oil provides high energy per unit mass, supporting aviation, shipping and road transport. |
| Reliability | Coal and gas can generate electricity on demand when intermittent renewables lack storage. |
| Infrastructure | Pipelines, refineries, vehicles and power stations embody large past investments. |
| Economic interests | Jobs, exports and government revenue create political resistance to rapid change. |
| Unequal access | Lower-income societies may prioritize affordable energy and development. |
| Technology | Batteries, grids and low-carbon alternatives are not equally available or suitable for every sector. |
The 2022 European energy crisis, intensified by reduced Russian gas supplies, showed how reliance on gas infrastructure can threaten energy security and raise prices. It also accelerated renewable investment and diversification.
A common misconception is that renewable energy can immediately replace all fossil fuels. Renewables support decarbonization, but storage, grid capacity, costs and mineral-extraction impacts must also be addressed.
Exam Technique
For an explain question, link each factor to dependence using clear cause-and-effect reasoning. For evaluate, balance energy-security and development benefits against climate impacts, finite reserves and environmental justice, then give a supported conclusion using the named example.
