Global CO₂ Emissions

Carbon emissions plateau but remain dangerously high. 37.9 Gt CO₂ from fossil fuels (2026), 42.3 Gt total including land use. Atmospheric CO₂ 424 ppm (52% above pre-industrial). Only 6 years carbon budget left for 1.5°C at current rates.

37.9 Gt

CO₂ from fossil fuels & industry (2026)

424 ppm

atmospheric CO₂ concentration (52% above 1750)

235 Gt

remaining carbon budget for 1.5°C (50% probability)

+1.36°C

current warming above pre-industrial (2026)

Key CO₂ Emissions Insights

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Emissions Plateau Finally Reached

Fossil fuel CO₂ emissions 37.9 Gt (2026), growing only +0.3% vs +0.8% (2024). Power sector emissions declining -0.8% as renewables displace coal. Total emissions 42.3 Gt including land use (+4.4 Gt from deforestation). Plateau not peak—emissions must fall 43% by 2030 for 1.5°C. OECD emissions down 15% since peak (2007).

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Top Emitters Diverging

China 12.7 Gt (32% of global), USA 5.0 Gt (13%), India 3.2 Gt (8%), EU 2.3 Gt (6%), Russia 1.8 Gt. China emissions flat—solar/wind offsetting coal. India +4.8% fastest growth (coal expansion). USA -1.2% (gas-to-renewables shift). EU -3.5% (industrial decline, renewables). G20 accounts 77% of emissions but only 6 on track for Paris targets.

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Carbon Budget Critically Low

Remaining budget 235 Gt CO₂ for 1.5°C (50% probability)—6 years at current rates. 83% probability budget exhausted in 2025. For 2°C: 1,110 Gt left (27 years). Already emitted 2,550 Gt since 1850 (68% of 1.5°C budget). Every 0.1°C costs ~420 Gt. Overshoot likely—CDR (carbon removal) needed to return below 1.5°C by 2100.

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Sectoral Breakdown Critical

Power 29% of emissions (declining), transport 15% (aviation/shipping growing), industry 21% (steel, cement, chemicals), buildings 7%, agriculture 12% (methane-heavy), land use 10% (deforestation). Power sector only major sector declining (-235 Mt in 2026). Transport +1.8%, industry +0.5%. Non-CO₂ GHGs (methane, N₂O) 25% of warming—often overlooked.

Key Finding: Emissions grew from near-zero (1850) to 5 Gt (1950) to 42.3 Gt (2026). Exponential growth 1950-2010 (+3%/year). Growth slowing post-2010 (+1%/year) as renewables scale. Fossil fuels 90% of increase. Land use emissions 4.4 Gt stable (deforestation vs reforestation balanced).

Key Finding: China 12.7 Gt (32%), USA 5.0 Gt (13%), India 3.2 Gt (8%), EU 2.3 Gt (6%), Russia 1.8 Gt (5%). Top 5 = 64% of global. China's per capita 9.0 tCO₂ now exceeds EU (5.1). USA highest at 15.0 tCO₂/person. Global average 5.0 tCO₂/person. Historical responsibility: USA 25%, EU 17%, China 14% of cumulative emissions.

Key Finding: Power & heat 29% (declining), industry 21% (cement, steel), transport 15% (road 74%, aviation 12%), agriculture 12% (livestock methane), buildings 7%, land use 10%, waste 3%. Power only sector with absolute decline. Aviation emissions +55% since 2000. Methane (agriculture, fossil fuels) drives 30% of warming but often excluded from CO₂-only stats.

Key Finding: CO₂ concentration 424 ppm (2026), up from 280 ppm (1750) and 315 ppm (1960). Growing 2.5 ppm/year (accelerating from 1.5 ppm in 1990s). Rate fastest in 66 million years. Last time CO₂ this high: Pliocene epoch 3M years ago (2-3°C warmer, seas 15m higher). Natural carbon sinks (forests, oceans) absorbing only 50% of emissions.

Key Finding: 1.5°C budget: 235 Gt (6 years), 1.7°C: 585 Gt (14 years), 2°C: 1,110 Gt (27 years) at current emission rates. Already used 2,550 Gt since 1850. Uncertainty range ±250 Gt due to climate sensitivity, non-CO₂ gases, carbon cycle feedbacks. Every year of delay reduces budget by 38 Gt. Paris targets (NDCs) lead to 2.4-2.7°C warming.

Key Finding: Global intensity fell from 0.45 kg/$GDP (2000) to 0.28 kg (2026)—38% improvement. Decoupling GDP growth from emissions. China improved 60% (0.80 → 0.32), India 35% (0.50 → 0.33), USA 42% (0.40 → 0.23), EU 50% (0.30 → 0.15). Driven by efficiency, renewables, service economy shift. Need 8%/year decline for 1.5°C vs current 2%.

Understanding CO₂ Emissions Data

Key Concepts

CO₂ vs CO₂-equivalent (CO₂e): CO₂ is carbon dioxide only. CO₂e includes all greenhouse gases (methane, N₂O, F-gases) converted to CO₂ warming equivalence. Total GHG emissions ~53 Gt CO₂e vs 38 Gt CO₂ alone.

Carbon Budget: Total CO₂ that can be emitted while staying below temperature target. Cumulative, not annual. 1.5°C budget ~2,900 Gt total; 2,550 Gt already used (1850-2025); 235 Gt remaining (2026 onward).

Territorial vs Consumption: Territorial = emitted within borders. Consumption = emissions embedded in goods consumed (imports - exports). China's consumption emissions 15% lower than territorial; USA 10% higher.

Carbon Sinks: Nature removes ~20 Gt CO₂/year (11 Gt land, 9 Gt ocean). Net emissions = gross (42 Gt) - sinks (20 Gt) = 22 Gt accumulating in atmosphere. Sinks weakening—forests stressed, ocean warming reduces uptake.

Measurement Methods

Bottom-up (inventories): Sum emissions from fuel sales, industry reports, activity data. Used by UNFCCC, national agencies. Accuracy ±10%.
Top-down (atmospheric): Measure CO₂ concentration changes via satellites, ground stations. Infer emissions. Validates inventories, detects underreporting.
Sectoral approach: IEA method—allocate electricity emissions to end-use sectors (buildings, industry). IPCC method—count at point of emission (power plant).

Historical vs Projected

Historical data (pre-2024): High confidence from fuel statistics, cement production, land surveys. 2024-2026: Preliminary estimates from IEA, GCP—subject to revision (±5%). Projections (2027+): Scenarios depend on policy, technology, economics—ranges from SSP1-1.9 (net zero) to SSP5-8.5 (high emissions). Paris NDCs currently lead to 2.4-2.7°C warming.