We will explore the process of burning fossil fuels and look at why they are burned and what sectors use the energy they supply. Then, we will cover what sort of products and greenhouse gases are released when fossil fuels are burned. Finally, we’ll view alternative energy solutions that are available for energy production.
Key takeaways
- Fossil fuels still supplied about 86% of global energy in 2025, only a slight decline from roughly 87% in 2024.
- Burning fossil fuels releases six main products: carbon dioxide, carbon monoxide, sulfur dioxide, nitrogen oxides, lead, and particulate matter.
- Carbon dioxide accounts for roughly 74% of global greenhouse gas emissions, and burning fossil fuels is the single largest source of it.
- Natural gas is the cleanest-burning fossil fuel, but it’s still primarily methane, a potent greenhouse gas.
- The three adverse effects of burning fossil fuels are air pollution, water pollution, and climate change.
- Renewable energy, nuclear power, and carbon offset programs are all viable ways to reduce reliance on fossil fuels today.
Fossil Fuels in 2026: The Latest Data
Despite years of clean energy investment, fossil fuels haven’t lost much ground yet, they’ve mostly just been joined by more of everything else. Here’s the latest picture, based on the Energy Institute’s 2026 Statistical Review of World Energy and the U.S. Energy Information Administration (EIA).
2026 fossil fuel data snapshot
- Global energy mix: Fossil fuels supplied about 86% of the world’s total energy in 2025, down only slightly from roughly 87% in 2024. Oil provided about a third of global supply, followed by coal and natural gas.
- Coal set a new record: Global coal use hit an all-time high in 2025, even as renewables grew faster in percentage terms, because total global energy demand kept rising alongside it.
- U.S. electricity: About 58% of U.S. utility-scale electricity generation came from fossil fuels in 2025 (down from roughly 60.6% in 2020), with natural gas alone supplying about 41%. Renewables reached nearly 26% of U.S. generation.
- Emissions: Global carbon dioxide emissions from energy rose 1.1% in 2025, with China accounting for roughly 31% of global emissions.
The takeaway: fossil fuel combustion is still growing in absolute terms even as its share of the energy mix inches down, which is why the effects and alternatives covered below remain just as relevant in 2026 as ever.
What Are Fossil Fuels?
Most of the fossil fuels we exploit today are the product of plants and animals that died 540 million to 65 million years ago and were buried in layers of sediment. Over time, the fossils were subjected to increased pressure and heat as the sedimentary rock layers of the earth’s crust continued to develop above them.
Eventually, these fossils turned into kerogen, also known as oil shale. After even more time, the oil shale was subjected to even greater temperatures and ultimately transformed into coal, oil, or natural gas. Fossil fuels consist of energy stores called hydrocarbons that form during exposure to immense heat and pressure.
What Is Fossil Fuel Combustion?
Fossil fuel combustion is the process of burning coal, oil, natural gases, or other fossil fuels to create energy. The use of fossil fuels creates around 80% of the world’s energy. While these fuels are an inexpensive way to produce power, they release large amounts of carbon dioxide and other greenhouse gases when combusted.
Creating electricity through burning fossil fuels utilizes a steam generator to create power. Fossil fuels are burned to heat water in boilers that make large amounts of steam. High pressure from the steam then rotates a turbine in a steam generator and creates power. This power is then transferred into the power supply.
Other forms of fossil fuel combustion come from the transportation sector. Burning fuel to power cars, trucks, and airplanes are all forms of fossil fuel combustion.
What Happens When You Burn Fossil Fuels?
Due to the presence of hydrocarbons, fossil fuels produce a substantial amount of energy per pound when combusted. Hydrocarbon-rich fossil fuels hold a large amount of energy potential that is released in the form of heat when combusted in the presence of oxygen.
However, these hydrocarbons also produce large amounts of carbon dioxide, which contributes to the greenhouse effect and in turn causes global warming. As the hydrocarbon compounds break down during combustion, the carbon dioxide is released alongside the heat energy.
Why Are Fossil Fuels Burned?

Burning fossil fuels creates energy in many different ways for people worldwide. Fossil fuels are responsible for powering the energy sector, transportation sector, and industrial sector.
In the energy sector, people rely on electricity generation for lighting, heating, and cooling in their homes and places of business. As of 2025, about 58% of U.S. utility-scale electricity generation still came from burning fossil fuels, according to the U.S. Energy Information Administration. Natural gas is also commonly used in homes and commercial buildings for heating, cooking, and other needs.
Fossil fuels are also used to power the transportation sector. In 2020, the U.S. transportation sector received 89% of its energy from petroleum fuel sources. People rely on personal vehicles, public transportation, and air travel to get where they need to be. Many of these modes of transportation rely on burning fossil fuels. Fossil fuels also power the transportation of goods around the world. Cargo ships, trucks, and airplanes are often powered with petroleum fuels.
Finally, the industrial sector relies on fossil fuels to create heat for their industrial practices and to create power to manufacture products. The industrial sector uses energy generated by burning fossil fuels to power electrical equipment like motors, lights, computers, and more. The manufacturing industry is responsible for using the most energy within the industrial sector.
What Do Fossil Fuels Release When Burned?
Six products are released due to the burning of fossil fuels. Each of these products affects the environment in different ways.
Carbon Dioxide
Of all the greenhouse gases, carbon dioxide is the most abundant when it comes to human-related emissions. Carbon dioxide is released in large quantities from burning coal, gas, and oil because these fuels are primarily composed of hydrocarbons released in the form of carbon dioxide once combusted. Coal burning is the primary source of carbon dioxide emissions, followed by burning oil, then natural gas.
Carbon Monoxide
Carbon monoxide is released when carbon-based fuel is not completely burned. The primary source of carbon monoxide emissions comes from road vehicles. Non-road vehicles, like boats or construction equipment, also contribute to carbon monoxide emissions.
Sulfur Dioxide
Sulfur dioxide is found in coal and oil. It can be emitted when these fossil fuels are burned and through the process of extracting gasoline from crude oil. When sulfur dioxide dissolves into water vapor and forms sulfuric acid, it interacts with other gases in the air, and sulfates are formed. This can lead to acid rain.
Nitrogen Oxides
Nitrogen oxides are released when fossil fuels are burned at high temperatures in motor vehicles or from other fuel-burning sources in industrial or home settings. Nitrogen dioxide, one common form of nitrogen oxide, creates smog over city centers.
Lead
Lead used to be a more common emission when leaded gasoline was used for vehicles. Today, most lead pollutants can be found in the air around factories that separate metal from ore.
Particulate Matter
Particulate matter is any solid particle or liquid droplet found in the air. Particulate matter is released when fossil fuels are burned and can be found in higher concentrations in regions that burn more fuels, like city centers or power facilities.
Why Is Burning Fossil Fuels a Problem?
The primary issue associated with burning fossil fuels is that the practice releases large quantities of greenhouse gases into the atmosphere. High concentrations of greenhouse gases in the atmosphere increase the global temperature and cause climate change.
Carbon dioxide is the most emitted greenhouse gas, accounting for roughly 74% of global greenhouse gas emissions, according to the Center for Climate and Energy Solutions’ analysis of European Commission emissions data. Burning fossil fuels is the activity responsible for emitting the most carbon dioxide around the world.
As the world continues to rely on fossil fuels for energy production and transportation, carbon emissions will continue to remain high. Global CO2 emissions from energy rose another 1.1% in 2025. If the globe does not mitigate the amounts of carbon dioxide released by burning fossil fuels, then we will continue to see increasing global temperatures and climate change.
What Are 3 Effects of Burning Fossil Fuels?
There are three adverse effects of burning fossil fuels: air pollution, water pollution, and climate change. These effects are caused by the products released when fossil fuels are burned.
Air Pollution
Air pollution occurs when products like sulfur dioxide, carbon monoxide, nitrogen oxides, and particulate matter are released from burning fossil fuels. Air pollution has been found to cause respiratory disease, cardiovascular disease, and cancer. Children, pregnant women, and elderly people are all at higher risk of the negative health effects caused by air pollution.
Water Pollution
Water pollution occurs when sulfur dioxide dissolves into water and creates sulfuric acid. This produces acid rain and can lead to the acidification of freshwater sources like lakes and streams. When these bodies of water become too acidic, life cannot survive in them. Acid rain can also affect local crops and soil acidity levels.
Climate Change
Climate change is a significant threat to ecosystems and human populations worldwide. Carbon dioxide emitted through burning fossil fuels plays a huge role in global warming. As more carbon dioxide is released into the atmosphere, more heat is trapped on earth through the greenhouse effect. Increasing global temperatures can lead to rising sea levels, deforestation, changing climates, and scarcity of food sources.
Which Fossil Fuel Is the Cleanest Burning?
Of the three primary fossil fuels, the cleanest burning fuel is natural gas. Using natural gas to generate energy emits less of all kinds of air pollutants and carbon dioxide than both oil and coal.
While natural gas is cleaner to burn for energy, it consists primarily of methane, a harmful greenhouse gas. Natural gas leaks are a leading cause of methane emissions each year in the United States. What is more, the process of locating natural gas wells and drilling for natural gas can have negative environmental impacts.
What Are Alternatives to Burning Fossil Fuels?
Alternatives to burning fossil fuels include renewable energy sources like hydroelectricity, wind power, and solar energy. Clean energy from nuclear power plants is another alternative to burning fossil fuels.
The benefit of transitioning to clean energy is a significant reduction in emissions. Nuclear energy and renewable energy sources have no emissions, which can slow the effect of climate change around the world.
A switch to entirely renewable energy systems would provide the best alternative to fossil fuels. Fossil fuels are non-renewable, meaning once the natural resource is diminished, we will not be able to continue using it. On the other hand, sustainable energy sources provide us with a supply we can never run out of, meaning increased energy security for future generations.
The Intergovernmental Panel on Climate Change emphasizes that these energy sources are essential for achieving long-term emissions reductions.
Burning Fossil Fuels? Only for the Time Being
Burning fossil fuels provides the majority of global energy. However, this natural resource is not sustainable and releases many harmful emissions when it is burned.

While fossil fuels are cheap and efficient, the globe should move forward to find better solutions on how to create energy. That way, we can avoid the negative effects that come along with burning fossil fuels while still providing the energy our planet relies on.
In the meantime, while the world energy system is still dependent on fossil fuels, you can make a difference by participating in carbon offsetting programs. These programs are designed to mitigate the carbon released from activities that burn fossil fuels.
For example, if you are taking a flight somewhere, you can purchase carbon offset credits that go toward projects that support reducing the amount of carbon in the atmosphere. Visit Terrapass today and view all of our carbon offset programs for individuals and businesses.
FAQ: Burning Fossil Fuels
What happens when you burn fossil fuels?
Burning fossil fuels releases the energy stored in their hydrocarbons as heat, along with six main byproducts: carbon dioxide, carbon monoxide, sulfur dioxide, nitrogen oxides, lead, and particulate matter.
Why are fossil fuels burned in the first place?
They’re burned because they’re an energy-dense, relatively inexpensive way to generate power for electricity, transportation, and industry. Fossil fuels still supplied about 86% of global energy in 2025.
What are the effects of burning fossil fuels?
The three main effects are air pollution, water pollution, and climate change, driven by the carbon dioxide, sulfur dioxide, and other byproducts released during combustion.
Which fossil fuel burns the cleanest?
Natural gas is the cleanest-burning of the three primary fossil fuels, emitting less air pollution and CO2 than coal or oil, though it’s still mostly methane, a potent greenhouse gas.
What are the alternatives to burning fossil fuels?
Renewable sources like solar, wind, and hydroelectric power, along with nuclear energy, are the main zero-emission alternatives. All are considered essential for long-term emissions reductions.
Is the world still relying on fossil fuels in 2026?
Yes. Fossil fuels supplied about 86% of global energy in 2025, and global coal use hit a new record even as renewables grew, because overall energy demand keeps rising.
Brought to you by terrapass.com
The post What Happens When You Burn Fossil Fuels? Effects & Alternatives appeared first on Terrapass.
Carbon Footprint
Climate-Linked Supply Chain Risk Is Already in Your P&L
The earnings calls that quietly reframed climate from sustainability question to operating risk.
Three earnings calls in the last 18 months tell the story without any help from a press release.
Hershey, May 2024: cocoa price exposure compresses margin, and the company attributes part of the cost shock to West African weather. Olam, July 2024: coffee climate exposure quantified in the annual report. JBS, January 2025: supply chain climate disclosures expanded materially in response to investor pressure and regulatory expectation. None of these companies issued the announcement as climate news. They issued it as financial news. The climate-linked supply chain risk did not arrive with a sustainability framing; it arrived as a P&L line.
You are probably reading this article because you suspect the same thing is happening to your business. This piece walks through what is showing up on which earnings calls, how procurement and finance leaders are quantifying the exposure, and what serious corporates are doing about it before the regulator asks.
Where climate risk has already appeared in earnings
The pattern is consistent across resource-intensive sectors. A weather event compresses supply, the price spikes, the cost flows through the income statement, and the analyst on the call asks whether the event is anomalous or structural. Increasingly, the honest answer is the second one.
Cocoa is the cleanest example. The 2023 to 2024 West African harvest fell sharply on the back of erratic rainfall and disease. Cocoa futures more than tripled. Companies with concentrated West African sourcing absorbed the cost; companies with diversified sourcing absorbed less. The exposure was not climate as ESG topic. It was climate as cost of goods.
Coffee follows the same pattern. Brazilian and Vietnamese harvests have moved on weather more sharply across the last several seasons. Roasters with long-tenor supplier relationships and origin diversification have managed the volatility; roasters with spot-market exposure have not. Wheat, sugar, palm oil, beef: the same dynamic in different commodities, a pattern the IPCC AR6 Working Group II report projects will intensify across agricultural systems through mid-century.
What this means: climate risk is no longer a footnote in the 10-K. It is a line item the CFO has to explain on the call.
The three commodity exposures that hit margin first
For most companies with material Scope 3 exposure, three exposures dominate the near-term P&L risk.
- Concentrated single-origin sourcing in a climate-vulnerable region. If your tier-one supply for any material commodity sits in one geography, you have a concentration risk that climate amplifies. Diversification across origins is the obvious hedge, but it takes years to build and requires relationships you cannot acquire by tender.
- Supplier financial fragility under climate stress. Smallholder farmers, who supply a large share of the global cocoa, coffee, and palm oil market, do not carry the balance sheets to absorb yield shocks. When yields collapse, they exit. When they exit, your supply base shrinks, and the surviving suppliers raise prices. The risk is structural, not cyclical.
- Logistics and storage exposure to extreme weather. Hurricane disruptions to Gulf shipping, drought-driven Panama Canal restrictions, flooding in European inland waterways: each of these has moved input costs in the last three years, a pattern documented in Munich Re’s natural catastrophe data. The exposure shows up as a one-quarter event in the financial press but accumulates over time on the cost line.
TCFD and ISSB disclosure changes
The disclosure architecture has now caught up with the risk. The Task Force on Climate-related Financial Disclosures, whose recommendations are now embedded in the ISSB’s IFRS S2 climate standard, requires companies to disclose climate-related risks across physical and transition categories, with quantification where possible.
For physical risk specifically (the climate-linked supply chain risk you are reading about), the disclosure must address both acute exposures (extreme weather events) and chronic exposures (gradual changes in temperature, precipitation, and growing seasons). The disclosure must address the time horizon over which the risk is material, the parts of the value chain exposed, and the financial impact under different scenarios.
The CSRD imposes similar requirements under European law, with double materiality (both financial and impact materiality) embedded in the assessment. The practical effect: your auditors and your investor relations team now need a defensible answer to the climate-linked supply chain risk question, and the answer needs to be quantified.
What procurement and finance can do now
Three actions matter near-term.
Map your exposure. Most companies do not have a clear view of which tier-one and tier-two suppliers sit in which climate-vulnerable geographies. Without the map, you cannot quantify the risk, and without the quantification, you cannot disclose it credibly. The map is the foundation, and World Resources Institute climate risk research provides useful public tooling to start.
Diversify and deepen, in that order. Diversification across origins reduces concentration risk, but the deeper move is to invest in the resilience of the suppliers you already have. Regenerative practices, agroforestry, soil health interventions: these reduce yield volatility under climate stress and protect your input cost trajectory.
Embed the climate spend inside procurement, not outside it. Treating climate risk as a sustainability cost line subordinates it to the ESG budget. Treating it as a procurement and resilience investment puts it in the budget that matters, which is the cost-of-goods budget that the CFO defends quarterly.
Nature-based supply chain investments are the asset class designed for exactly this purpose. They sit inside the value chain, they reduce climate-linked supply risk, they generate verifiable Scope 3 reductions, and they produce the documentation an auditor and a regulator can both test.
If you are quantifying climate-linked supply chain risk in advance of the next earnings cycle or the next disclosure period, the carbon and sustainability experts at Carbon Credit Capital can help you map your exposure and structure a Dual-Value Model response that addresses reduction, resilience, and disclosure-readiness in a single program. Schedule a consultation.
Carbon Footprint
Where should an SME start with a carbon action plan?
More and more small and medium-sized businesses are hearing the same question from their larger customers: What is your carbon footprint? That question now travels down entire supply chains, and it arrives next to tender requirements, certification criteria, and rising customer expectations.
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Carbon Footprint
Insetting vs Offsetting: Which Actually Counts Toward Your Scope 3 Targets
The accounting differences that decide whether your nature investment shows up in inventory, in BVCM, or nowhere at all.
The question reaches a procurement team about three weeks before the next sustainability committee meeting. Someone has read about insetting. Someone else has just signed off on an offset purchase. The CSO wants to know if the two are interchangeable. The answer is no, and the GHG Protocol Land Sector and Removals Standard is the reason why.
This article walks through what each term means at audit-grade specificity, what the standards actually say about how each gets counted, and how to decide which tool fits which target. The insetting vs offsetting question is one of the most-searched in corporate climate strategy, and one of the most poorly answered. By the end of this piece, you should be able to brief a committee on the difference without notes.
The two definitions, in plain English
Offsetting means buying carbon credits generated outside your value chain and retiring them against your residual emissions. The reduction happens somewhere else, financed by you, and the credit is the receipt.
Insetting means investing in emission reductions or removals inside your own value chain, typically with suppliers, where the reduction is directly linked to the products and services you buy. The reduction happens inside the boundary of your Scope 3 inventory, and the accounting treatment is fundamentally different.
The shorthand from the University of Oxford’s Nature-based Insetting Initiative is useful: insetting is what you do with the supply chain you have; offsetting is what you do with the supply chain you do not have.
What the GHG Protocol Land Sector Standard actually says
The GHG Protocol Land Sector and Removals Standard, finalised in 2024 after a multi-year pilot, sets the rules for how land-based emission reductions and removals enter corporate inventories. The Standard distinguishes between inventory accounting (Scope 1, 2, and 3) and project or intervention accounting (a separate methodology for crediting).
For insetting, the practical implication is that supplier-level interventions, when properly measured and attributed, can reduce your Scope 3 category 1 (purchased goods and services) emissions in your inventory. The reduction is not a credit retired against the inventory; it is a lower inventory number, period.
For offsetting, the credit is retired separately. It can be reported as a contribution toward a net-zero claim under the SBTi Beyond Value Chain Mitigation framework or as part of a VCMI Carbon Integrity claim, but it does not lower the inventory number.
A practical consequence: if your Science Based Target requires a 50% absolute reduction in Scope 3 emissions by 2030, insetting moves you toward the target. Offsetting does not. This single point of difference reshapes the procurement decision.
When insetting counts toward Scope 3 (and when it does not)
Insetting counts toward Scope 3 only when several conditions are met:
- The intervention must occur with an entity in your value chain.
- The emissions reduction or removal must be measured against a defensible baseline.
- The reduction must be attributed to your share of that supplier’s output, not double-counted with other buyers.
- It must follow the inventory accounting rules in the GHG Protocol Land Sector Standard, not the project accounting rules used to generate credits.
The most common failure mode is double counting. If your supplier sells the same reduction as a credit on the voluntary market and also reports it to you as a Scope 3 reduction, the math breaks. The Standard requires you to address this risk, typically by purchasing and retiring the supplier-issued credit as part of your inventory or by contractual provisions that prevent the supplier from selling the reduction twice.
When insetting does not count toward Scope 3: when the intervention sits with a supplier you do not buy from, when the baseline is not defensible, when the attribution is unclear, or when the documentation does not survive audit. Those cases default to Beyond Value Chain Mitigation, which is still useful but operates on a different ledger.
The procurement and supplier engagement question
Insetting is harder than offsetting. That is the unfashionable truth most buyers eventually confront. Offsetting is a transaction; insetting is a relationship.
To run an insetting program, you need supplier mapping precise enough to know which farms or facilities sit at which Scope 3 boundary. You need an engagement model that gets suppliers to participate, which usually requires multi-year commitments and shared economics. You need an MRV architecture that measures the right things and produces audit-ready documentation. And you need a contractual structure that prevents double counting and protects both sides.
The trade-off you receive in return is significant. Reductions count against your inventory rather than your residual. Supplier relationships deepen, which protects sourcing continuity. Yield and quality improvements often follow regenerative interventions, which reduces your input cost over time. And the regulatory file, under CSRD, CSDDD, EUDR, and the SBTi FLAG Guidance, is materially stronger.
Choosing the right tool for the right target
A practical decision rule. If your target is a science-based Scope 3 reduction and you operate in a FLAG sector or source FLAG commodities, insetting is the structurally correct tool. If your target is a net-zero claim that includes neutralising hard-to-abate residual emissions outside your value chain, BVCM via high-integrity offsets is the structurally correct tool. Most companies with material Scope 3 exposure need both, in different proportions, sequenced over time.
The sequencing matters. Insetting takes longer to stand up but produces a permanent reduction in the inventory. Offsetting can be transacted faster but does not change the inventory and now sits under tighter claim restrictions. Treat them as complementary tools with different jobs, not as substitutes. The Accountability Framework Initiative and the IUCN Global Standard for Nature-based Solutions both provide useful guardrails for the insetting side, with biodiversity, human rights, and benefit-sharing requirements that go beyond carbon math.
If you are mapping a Scope 3 reduction roadmap and need to scope which interventions count toward your inventory versus which sit in Beyond Value Chain Mitigation, the carbon and sustainability experts at Carbon Credit Capital can help you structure a nature-based supply chain investment program that fits your FLAG exposure, your target architecture, and your audit horizon. Schedule a consultation.
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