The 90 biggest producers of fuels driving climate change include investor-owned corporations, such as Exxon Mobil and Chevron, and state-owned oil companies, such as Saudi Aramco and Mexico’s Pemex.
The study attributes 914 billion metric tons of greenhouse gases to the fuels extracted by the companies, which is 63 per cent of the total 1450 billion metric tons of emissions estimated since the mid-19th century.
The study, published in the journal Climatic Change, also found that of the 914 billion metric tons, half was pumped into the atmosphere since 1986, a result of the rapid industrialisation of the developing world.
The journal focuses on the causes and implications of climatic change.
“This is the most complete picture we have of which institutions extracted coal, oil and natural gas and when,” said Richard Heede, the study’s author and head of the Climate Accountability Institute, a small research group in Snowmass, Colorado.
“These are the companies and institutions that have created the products – used as intended – by billions of consumers that have led to persistently higher levels of atmospheric carbon dioxide and methane,” Heede said.
Emissions of carbon dioxide, methane and other greenhouse gases are generally tracked by country.
Yet efforts to fashion binding international climate agreements have failed repeatedly, including at a United Nations climate meeting being held now in Warsaw that has grown increasingly acrimonious.
In the face of the diplomatic stalemate, the study focused on the companies that produce fossil fuels to prompt them “to become part of the solution rather than passive (and profitable) bystanders to continued climate disruption.”
Heede and his research team spent eight years tracing data about companies from international sources, like the United Nations Intergovernmental Panel on Climate Change, as well as corporate records for oil, gas and coal companies and cement producers.
If a company was nationalised or acquired by a rival, the carbon production and emissions of the older company are attributed to the current one.
The study did not examine carbon dioxide emissions from deforestation, agriculture or landfills.
The top five producers of fuels driving climate change over the last 150 years are Chevron, Exxon Mobil, Saudi Aramco, BP and GazProm, the Russian company that is the world’s largest natural gas producer.
Two major US coal and natural gas companies, Peabody Energy and Consol Energy, were among the top 20.
The developed world, most notably the United States, has been seen as the main emitter of greenhouse gases until recently.
But the study showed that the producers of carbon-rich fuel the world consumed include state-owned companies from many developing countries.
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