"Every molecule of fossil fuel is ancient sunlight — photosynthesised by organisms that lived before the dinosaurs, compressed by the weight of continents. When we burn coal or oil, we are releasing energy that was captured from the sun hundreds of millions of years before humans existed. We did not make it. We are spending it."
— The Energy Codex · observation without ownership · thecodex.expert
Section A · All five fuel types
The five fuels — choose your deep dive
Every fuel type is documented completely on its own page. Each page covers: how the fuel formed or is made, every major deposit or facility with GPS, the complete supply chain, key companies, pioneers, what the fuel gave the world, and what the future holds.
Fossil fuel · Liquid
Oil & Petroleum
160 million years of geological history. The world's most consumed energy source. From Ghawar to Jamnagar — the complete supply chain. Every major field with GPS.
1.73T bbl reserves
100M bbl/day consumption
31% global energy
Read Oil →Built ✓
Fossil fuel · Solid
Coal
The fuel that powered the Industrial Revolution. From Jharia to Shanxi to Appalachia — the world's most abundant fossil fuel, and the one with the highest carbon emissions.
1.07T t reserves
~132 yrs at current use
820 g CO₂/kWh
Read Coal →
Fossil fuel · Gas
Natural Gas
The cleanest-burning fossil fuel. The bridge between coal and renewables. From South Pars to your kitchen stove — how gas travels the world as LNG.
188T m³ reserves
~490 g CO₂/kWh
23% global energy
Read Natural Gas →
Fuel · Energy carrier
Hydrogen
Not a source — a carrier. Green, grey, blue, turquoise, pink. The $320 billion bet on decarbonising shipping, steel, and aviation. What the colours mean.
120M t/yr produced
142 MJ/kg energy density
$320bn global investment
Read Hydrogen →
Renewable fuel · Organic
Biomass & Bioenergy
The oldest energy source — fire. Today: wood pellets, biogas, bioethanol, biodiesel, biojet. The Drax transformation. What makes biomass renewable and when it is not.
~10% global primary energy
2,595 MW Drax, UK
230M t ethanol/yr
Read Biomass →
Cluster 5 · What fuels gave the world
What fossil fuels built for human civilisation
The Industrial Revolution — coal made it possible
Before coal, most human labour was done by human muscle, animal power, and wood. The steam engine running on coal changed this permanently. By 1850, Britain's coal-fired steam engines were doing the equivalent work of 40 million horses. Coal smelted the iron and steel that built railways, bridges, and factories. It powered the looms that produced textiles for a global market. It heated the blast furnaces that made the artillery and machinery of modern states. Every element of the modern industrial world traces to the moment coal began to be burned in steam engines in the 1760s. Source: IEA WEO 2024 historical analysis
Oil and gas — mobility and food for 8 billion
Oil enabled mass personal transport — the automobile and the aeroplane. Natural gas enabled the Haber-Bosch process, which synthesises ammonia for fertilisers. It is estimated that without Haber-Bosch nitrogen fertilisers (which require natural gas), approximately half of the world's current population could not be fed — the nitrogen in the bodies of approximately 4 billion people was fixed from the atmosphere using fossil-derived hydrogen. Source: FAO · IEA Petrochemicals 2023
Oil-derived petrochemicals also underpin medicines, plastics, synthetic fibres, and the materials of modern healthcare — the hospital is built substantially from petrochemical products.
Oil-derived petrochemicals also underpin medicines, plastics, synthetic fibres, and the materials of modern healthcare — the hospital is built substantially from petrochemical products.
Cluster 11 · The future of fossil fuels
What institutional sources project
IEA World Energy Outlook 2024 — the key projections
Net Zero Emissions 2050 scenario: All fossil fuel demand declines significantly. Coal demand falls ~95% by 2050. Oil demand falls from ~100M bbl/day to ~24M bbl/day (primarily for petrochemicals, not combustion). Natural gas declines but slower — still used for industrial heat and as hydrogen feedstock (with CCS).
Stated Policies Scenario (STEPS — reflecting actual government policies): Fossil fuels remain dominant to 2050 but decline in share. Coal peaks before 2030 and declines. Oil peaks around 2030. Gas peaks later. Fossil fuels still provide ~60% of primary energy by 2050 in STEPS.
The Advaita observation: Both scenarios are what sources document. Neither is advocacy. The world's future energy mix will be determined by billions of individual decisions, thousands of policy choices, and technologies not yet deployed at scale. This codex documents what institutions project — not what will happen.
Source: IEA World Energy Outlook 2024 · BP Statistical Review 2024
Stated Policies Scenario (STEPS — reflecting actual government policies): Fossil fuels remain dominant to 2050 but decline in share. Coal peaks before 2030 and declines. Oil peaks around 2030. Gas peaks later. Fossil fuels still provide ~60% of primary energy by 2050 in STEPS.
The Advaita observation: Both scenarios are what sources document. Neither is advocacy. The world's future energy mix will be determined by billions of individual decisions, thousands of policy choices, and technologies not yet deployed at scale. This codex documents what institutions project — not what will happen.
Source: IEA World Energy Outlook 2024 · BP Statistical Review 2024
Connected pages
Explore further
Sources
Sources used on this hub page
Primary sources
BP Statistical ReviewWorld Energy 2024 · Reserves, production, consumption for all fossil fuelsbp.com/statistical-review-2024
IEAWorld Energy Outlook 2024 · NZE 2050 · STEPS scenario · Petrochemicals 2023iea.org/weo-2024
OPECAnnual Statistical Bulletin 2024 · Member country dataopec.org
FAOFood security · Haber-Bosch nitrogen · Green Revolution analysisfao.org