Global greenhouse gas emissions reached about 54.1 Gt CO2e in 2025. China emitted the most (29.5%), followed by the United States (11.1%) and India (8.3%). Pow…
A Swedish chemist calculated how more carbon dioxide would warm the Earth.
Continuous CO2 measurements start at about 315 parts per million.
A panel to assess climate science for governments.
World emissions in the year most targets are measured from.
Adopted in New York, opened for signature at the Rio Earth Summit.
Binding cuts for developed countries, about 5% below 1990.
Well below 2C, pursue 1.5C; every country sets its own plan.
Cut CO2 about 45% by 2030 and reach net zero around 2050.
Lockdowns cut emissions about 3.6% to 49.3 Gt.
Energy 34%, industry 24%, land use 22%, transport 15%, buildings 6% (2019).
Triple renewables, double efficiency by 2030.
From 32.1 Gt in 1990 to 54.1 Gt in 2025.
The exit ordered in January 2025 takes effect.
Global emissions rose 0.7% in 2025.
China, the US and India: nearly half.
US +2.2%, China +0.1%, India -0.2%.
India 3.1 t per person; Saudi Arabia 22.7 t.
Power about 29%, industry 21%, transport 16%.
About 15.8 Gt a year, mostly from coal.
About 16% of emissions, including flights and ships.
About 11.7%, mostly methane and nitrous oxide.
CO2 73.8%, methane 17.6%, N2O 5.3%, F-gases 3.3%.
The treaties behind national targets.
Talks run to 20 November with emissions at a record.
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