The US, which has announced plans to withdraw from the global climate treaty – the UN Framework Convention on Climate Change (UNFCCC) – is more historically responsible for climate change than any other country or group.
Carbon Brief analysis shows that the US has emitted a total of 542bn tonnes of carbon dioxide (GtCO2) since 1850, by burning fossil fuels, cutting down trees and other activities.
This is the largest contribution to the Earth’s warming climate by far, as shown in the figure below, with China’s 336GtCO2 significantly behind in second and Russia in third at 185GtCO2.
The US is responsible for more than a fifth of the 2,651GtCO2 that humans have pumped into the atmosphere between 1850 and 2025 as a result of fossil fuels, cement and land-use change.
China is responsible for another 13%, with the 27 nations of the EU making up another 12%.
In total, these cumulative emissions have used up more than 95% of the carbon budget for limiting global warming to 1.5C and are the predominant reason the Earth is already nearly 1.5C hotter than in pre-industrial times.
The US share of global warming is even more disproportionate when considering that its population of around 350 million people makes up just 4% of the global total.
On the basis of current populations, the US’s per-capita cumulative historical emissions are around 7 times higher than those for China, more than double the EU’s and 25 times those for India.
The US’s historical emissions of 542GtCO2 are larger than the combined total of the 133 countries with the lowest cumulative contributions, a list that includes Saudi Arabia, Spain and Nigeria. Collectively, these 133 countries have a population of more than 3 billion people.
See Carbon Brief’s previous detailed analysis of historical responsibility for climate change for more details on the data sources and methodology, as well as consumption-based emissions.
Additionally, in 2023, Carbon Brief published an article that looked at the “radical” impact of reassigning responsibility for historical emissions to colonial rulers in the past.
This approach has a very limited impact on the US, which became independent before the vast majority of its historical emissions had taken place.
The post Analysis: World’s biggest historic polluter – the US – is pulling out of UN climate treaty appeared first on Carbon Brief.
Analysis: World’s biggest historic polluter – the US – is pulling out of UN climate treaty
Greenpeace International and Greenpeace organisations in the US filed on 27 March 2026 a motion for a new trial in North Dakota District Court. This demand for justice follows the absurd and flawed US$ 345 million judgment issued by the same court in Energy Transfer’s SLAPP lawsuit against the Greenpeace parties returned on 27 February 2026. Energy Transfer’s back-to-back SLAPP lawsuits are attempts to erase Indigenous leadership of the Standing Rock Movement, punish solidarity with the ongoing resistance to the Dakota Access Pipeline, and intimidate environmental activists from speaking out against Big Oil companies.
The motion for a new trial should be granted to prevent one of the largest miscarriages of justice in North Dakota’s history. We are demanding the court right the wrongs committed at trial and to ensure the rights and freedoms promised under the US constitution are protected.
Greenpeace will not rest until justice is served and Big Oil can no longer use and abuse the legal system in North Dakota or anywhere else.
Greenpeace International General Counsel Kristin Casper
There is no question the Greenpeace defendants were denied a fair trial — even a concise summary of the errors and injustices that marred the trial runs to over 100 pages.
Among the numerous egregious flaws documented in the motion for a new trial are:
- The Greenpeace defendants could not receive a fair and impartial trial in Morton County.
- Seven out of nine jurors that decided the case had clear biases due to fossil fuel industry ties, experiences with the Standing Rock protests, and/or preexisting negative views of the Greenpeace defendants.
- Despite the fact that thousands of individuals and hundreds of organisations were involved in actions at Standing Rock and speaking out against DAPL, and North Dakota law clearly requiring damages to be split among everyone who contributed to alleged harms, the jury and the court assigned 100% of the claimed damages to the Greenpeace defendants.
- The jury’s verdict was contrary to the weight of the evidence on each and every count.
- The jury verdict was tainted by the inclusion of inadmissible, prejudicial information.
- The jury was improperly prevented from hearing relevant, admissible evidence that was favorable to the Greenpeace defendants.
- The jury was provided erroneous and incomplete instructions and a flawed verdict form.
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