The global emissions gap by income group
According to the IEA’s 2023 analysis of energy-related CO₂ emissions by income group, the top 10% of emitters worldwide averaged 22 tons CO₂e per capita in 2021 — more than 200 times the average for the bottom 10%. Within that top bracket, the concentration becomes even more extreme. The IEA estimates that the richest 0.1% of the global population, a group that includes billionaires and ultra-high-net-worth individuals, each emit more than 200 tons CO₂e annually from energy use alone.
The IEA notes that the top 10% of global emitters are responsible for almost half of all energy-related CO₂ emissions worldwide. This group — approximately 782 million people — extends well beyond the ultra-wealthy to include upper-middle-income households in the United States, Canada, Australia, and Western Europe. An average American, regardless of personal wealth, is almost certainly in the global top 10% by emissions.
1,000×
The IEA estimates that the top 1% of global emitters have carbon footprints more than 1,000 times greater than those of the bottom 1%. The global average energy-related footprint is approximately 4.7 tons CO₂e per person per year.
Where does a typical American sit?
The EPA estimates the average US carbon footprint at approximately 14–16 tons CO₂e per person per year, when accounting for household energy, transport, food, goods, and services. The IEA notes that in the United States, the richest income decile emits over 55 tons CO₂e per capita annually, with road transport alone accounting for roughly one quarter of that figure. At the median, a US household sits at roughly 14 tons CO₂e — already more than three times the global average of 4.7 tons CO₂e.
This matters because most carbon footprint reduction guides are calibrated against a global average that is not the relevant benchmark for someone in a high-income country. The question is not whether you emit more than someone in sub-Saharan Africa — it is whether your footprint is high relative to what a sustainable global pathway requires, and where your largest reduction opportunities sit. A science-based target aligned with the 1.5°C pathway implies per-capita emissions of roughly 2.5 tons CO₂e by 2030, according to the IPCC Sixth Assessment Report (2022).
| Group | Est. annual footprint | vs global average (4.7t) |
|---|---|---|
| Global top 0.1% (billionaires) | >200 tons CO₂e | ~43× higher |
| Global top 1% | >50 tons CO₂e | ~11× higher |
| US top income decile | >55 tons CO₂e | ~12× higher |
| Average American | ~14–16 tons CO₂e | ~3× higher |
| Global average | ~4.7 tons CO₂e | Baseline |
| 1.5°C science-based target (2030) | ~2.5 tons CO₂e | Below average |
Sources: IEA (2023), IPCC AR6 (2022), EPA (2024). All figures are estimates for energy-related and consumption-based emissions; methodologies vary across studies.
Why the investment footprint changes everything
Lifestyle emissions — flights, diet, home energy, transport — are what most carbon calculators measure. For the vast majority of people, these are the only emissions categories that are practically actionable. However, for high-net-worth individuals, investment emissions often dwarf lifestyle emissions by a large margin. Oxfam’s 2022 analysis of 125 billionaires found that their investment-related emissions averaged 3 million tons CO₂e per person annually — a figure driven by equity stakes in fossil fuel, materials, and high-carbon industrial companies. This is categorically different from the consumption-based footprint that a personal carbon calculator measures.
For most individuals, the most impactful investment-related action is switching pension or retirement savings funds to a low-carbon alternative. According to Heller and Keoleian (2015), pension and investment holdings can represent the single largest category of an individual’s consumption-based footprint — larger than flights, diet, or home energy combined — once the upstream emissions of the underlying holdings are included. This is the finance category that Decarb’s calculator captures via PCAF v3 emission factors.
Methodology note
Investment emissions are calculated using PCAF (Partnership for Carbon Accounting Financials) v3 emission factors. These apply a weighted average carbon intensity to bank deposits, savings accounts, and investment holdings. The resulting figure is an estimate of the CO₂e attributable to the financial system’s deployment of those funds. It is not the same as the emissions directly produced by the individual — but it is a meaningful signal of systemic exposure. See Decarb’s full methodology for detail on PCAF application.
What this means for your reduction plan
Knowing where you sit relative to income and emissions percentiles is useful context, but it does not tell you where to focus. Two people with identical total footprints can have very different category breakdowns — one dominated by flights, another by home heating, another by diet. The highest-leverage actions depend on your individual profile, not the average. A ranked reduction plan, ordered by estimated tons CO₂e saved, is a more practical tool than a percentile comparison alone.
For reference, the five categories that typically account for the largest share of a US household footprint are: transport (particularly car use and flights), home energy (heating and electricity), diet (especially red meat and dairy), goods and consumption, and finance (savings and investments). The IEA notes that in the United States, road transport makes up approximately one quarter of the top income decile’s footprint — a higher share than in most other regions, partly due to lower vehicle efficiency and longer average commute distances.
Practical steps to reduce from a high baseline
Measure first. A ranked footprint calculation across all five categories identifies where the largest savings are, and avoids effort spent on low-impact changes. Decarb’s calculator covers diet, flights, home energy, transport, and finance, and outputs a ranked PDF report ordered by estimated tons CO₂e saved.
Address transport first if you own a petrol or diesel vehicle. Switching from an average petrol car to an EV typically saves 1.5–2.5 tons CO₂e per year, depending on your grid mix and mileage. This is frequently the single largest available reduction for US households. See Decarb’s guide to switching to an electric vehicle.
Check your pension or investment fund. Switching a pension or retirement savings fund to a fossil-free or ESG-screened alternative can reduce your attributable finance emissions by an estimated 1–3 tons CO₂e per year, depending on fund size and current holdings. This action is often overlooked but consistently ranks among the highest-impact changes for anyone with retirement savings.
Reduce flight frequency. A single long-haul return flight contributes approximately 1.5–3 tons CO₂e, depending on route, class, and whether radiative forcing multipliers are applied. Replacing one long-haul flight per year with a train journey or video call is one of the highest-leverage single actions for frequent flyers.
Switch to a renewable energy tariff. For households on a standard grid mix, switching to a verified renewable electricity tariff eliminates the majority of home electricity emissions. The EPA’s eGRID 2023 data puts the US average grid factor at 0.350 kg CO₂e per kWh — a household using 10,000 kWh per year on a standard tariff emits approximately 3.5 tons CO₂e from electricity alone.
Frequently asked questions
How does my carbon footprint compare to the top 1%?
According to the IEA, the top 1% of global emitters each produce more than 50 tons CO₂e per year from energy use alone. The average American emits approximately 14–16 tons CO₂e per year across all categories, placing them in the global top 10% but below the top 1% threshold in most estimates. High-income US households — the top income decile — average over 55 tons CO₂e per year, which does put them in or near top-1% territory globally.
What is a billionaire’s carbon footprint?
Oxfam’s 2022 analysis of 125 billionaires found that their investment-related emissions alone averaged approximately 3 million tons CO₂e per person per year — driven by equity stakes in high-carbon industries. Lifestyle emissions from private jets, multiple properties, and consumption add further, though these are small relative to investment emissions. It is important to note that investment emissions are an estimate of systemic exposure, not a direct measure of emissions personally caused.
Does individual action matter if the top 1% emit so much more?
Yes, for two reasons. First, the top 10% of global emitters — a group that includes most upper-middle-income households in wealthy countries — are collectively responsible for almost half of all energy-related CO₂ emissions. Reducing emissions within this group has a meaningful aggregate effect. Second, consumption choices within high-income households drive demand for high-carbon goods and services, creating upstream emissions far beyond what a simple footprint calculation captures. Individual action is not a substitute for systemic change, but it operates in parallel with it.
What percentage of global emissions comes from the richest 10%?
According to the IEA’s 2023 analysis, the top 10% of emitters globally were responsible for almost half of all energy-related CO₂ emissions in 2021. This group averaged 22 tons CO₂e per capita — compared with a global average of approximately 4.7 tons CO₂e. The bottom 50% of emitters, by contrast, contributed just 12% of total energy-related emissions.
How do investment emissions get included in a carbon footprint?
Investment emissions are calculated using the PCAF (Partnership for Carbon Accounting Financials) standard, which applies weighted average carbon intensity factors to financial holdings. For individuals, the most common method is to apply a sector-average emission factor to the value of savings, pension, and investment accounts. The result is an estimate of the emissions attributable to the financial system’s deployment of those funds into the real economy. Decarb uses PCAF v3 factors for this calculation.
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Sources
- IEA (2023). “The world’s top 1% of emitters produce over 1,000 times more CO₂ than the bottom 1%.” International Energy Agency. iea.org
- IPCC (2022). Sixth Assessment Report, Working Group III: Mitigation of Climate Change. Cambridge University Press.
- Oxfam International (2022). “Carbon Billionaires: The investment emissions of the world’s richest people.” Oxfam Briefing Note, November 2022.
- EPA (2024). “Greenhouse Gas Emissions: Sources of Greenhouse Gas Emissions.” United States Environmental Protection Agency. epa.gov
- EPA eGRID (2023). Emissions & Generation Resource Integrated Database. United States Environmental Protection Agency.
- Heller, M.C. & Keoleian, G.A. (2015). “Greenhouse Gas Emission Estimates of U.S. Dietary Choices and Food Loss.” Journal of Industrial Ecology, 19(3), 391–401.
- PCAF (2022). “The Global GHG Accounting and Reporting Standard for the Financial Industry.” Partnership for Carbon Accounting Financials, Second Edition.