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This lesson examines fossil fuel reserves, the peak oil debate, unconventional fossil fuels, energy pathways and the geopolitics of supply and demand. It addresses the Edexcel A-Level Geography (9GE0) specification, Topic 6, Enquiry Question: "What are the consequences of increasing demand for energy?"
Understanding the distinction between reserves and resources is fundamental:
| Term | Definition | Example |
|---|---|---|
| Resource | The total amount of a fossil fuel estimated to exist in the Earth's crust, regardless of whether it can be extracted economically | All coal deposits, including those too deep or thin to mine |
| Proven reserves | The quantity that can be extracted economically with current technology and at current prices | Saudi Arabia's proven oil reserves of ~267 billion barrels |
| Probable reserves | Estimated quantities likely to be recoverable (50% probability) | Deposits identified by exploration but not fully appraised |
| Possible reserves | Estimated quantities that might be recoverable (10% probability) | Deposits in unexplored but geologically promising areas |
Proven reserves are a dynamic concept — they change with:
| Fossil Fuel | Global Proven Reserves | R/P Ratio (years at current production) | Largest Reserves |
|---|---|---|---|
| Oil | ~1,570 billion barrels | ~50 years | Venezuela (303 bn), Saudi Arabia (267 bn), Canada (168 bn) |
| Natural gas | ~210 trillion m³ | ~49 years | Russia (48 tcm), Iran (34 tcm), Qatar (24 tcm) |
| Coal | ~1,070 billion tonnes | ~140 years | USA (249 bt), Russia (162 bt), Australia (150 bt) |
The Reserves-to-Production (R/P) ratio gives the number of years proven reserves would last at current production rates. However, this is a static measure that does not account for changing demand, new discoveries or technological change.
Exam Tip: The R/P ratio is frequently misinterpreted as "we will run out in X years." In reality, reserves are constantly being revised upward (new discoveries, technology) and demand may change. However, the finite nature of fossil fuels is undeniable — they will eventually become economically and physically exhausted.
Peak oil is the theoretical point at which global oil production reaches its maximum rate, after which production enters terminal decline.
In 1956, geologist M. King Hubbert predicted that US oil production would peak between 1965 and 1970. US conventional oil production did indeed peak in 1970, lending credibility to the theory. Hubbert predicted global peak oil around 2000.
However, the global peak did not occur as predicted because:
| Factor | Effect on Peak Oil |
|---|---|
| Unconventional oil (tar sands, shale oil, deepwater) | Vastly expanded recoverable reserves |
| Improved recovery techniques | Enhanced oil recovery (EOR) extracts more oil from existing fields |
| New discoveries | Deep-water reserves (Brazil pre-salt, Gulf of Mexico), Arctic potential |
| Demand changes | Economic recessions, efficiency improvements, and renewables reduce demand growth |
| Price signals | Higher prices stimulate exploration and make unconventional sources viable |
Current perspectives on peak oil:
| Perspective | Argument |
|---|---|
| Peak supply (traditional view) | Physical depletion will eventually limit production; unconventional sources only delay the peak |
| Peak demand (newer view) | Climate policy, electric vehicles and renewables will reduce demand before physical depletion occurs; "the Stone Age didn't end because we ran out of stones" |
| Plateau | Production may level off rather than peak sharply, as declining conventional output is offset by unconventional sources and falling demand |
The IEA's 2023 World Energy Outlook projected that demand for all three fossil fuels could peak by 2030 under current policy trajectories — a historic first.
As conventional reserves deplete, energy companies have increasingly turned to unconventional sources — those requiring more complex, expensive and often more environmentally damaging extraction methods.
Hydraulic fracturing (fracking) involves injecting high-pressure fluid (water, sand and chemicals) into shale rock formations to fracture the rock and release trapped oil and gas.
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