Greenhouse gas emissions

Quick Facts: Who was Greenhouse gas emissions?

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Greenhouse gas emissions

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Human activities intensify the greenhouse effect, driving global climate change.

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2Day Chrono-Wiki & Primary Historical Archives

Origins & Early Life

Greenhouse gas emissions (GHG emissions) from human activities intensify the greenhouse effect which contributes to climate change. Carbon dioxide (CO2) from burning fossil fuels (such as coal, oil, and natural gas) is the main cause of climate change. The largest annual emissions are from China followed by the United States, which has higher emissions per capita. The main producers fueling the emissions globally are large oil and gas companies.

Career & Major Achievements

Emissions from human activities have increased atmospheric carbon dioxide by about 50% over pre-industrial levels. The growing levels of emissions have varied, but have been consistent among all greenhouse gases. Over 60 billion tons were emitted in 2025, higher than any year before. Total cumulative emissions from 1870 to 2022 were 703 GtC (2575 GtCO2), of which 484±20 GtC (1773±73 GtCO2) from fossil fuels and industry, and 219±60 GtC (802±220 GtCO2) from land use change.

Enduring Legacy & Impact

Land-use change, such as deforestation, caused about 31% of cumulative emissions over 1870–2022, coal 32%, oil 24%, and gas 10%. Carbon dioxide is the main greenhouse gas resulting from human activities. It accounts for more than half of warming.

Chronological Milestones & Life Events

1. 1870: 1870 Milestone — Total cumulative emissions from 1870 to 2022 were 703 GtC (2575 GtCO2), of which 484±20 GtC (1773±73 GtCO2) from fossil fuels and industry, and 219±60 GtC (802±220 GtCO2) from land use change.
2. 2025: 2025 Milestone — Over 60 billion tons were emitted in 2025, higher than any year before.

Notable Quotes by Greenhouse gas emissions

“The growing levels of emissions have varied, but have been consistent among all greenhouse gases.”

Historical Fact-Check Quiz: Greenhouse gas emissions

True or False: “True or false: The primary source of cumulative greenhouse gas emissions between 1870 and 2022 was the burning of fossil fuels and industry.”

Answer (TRUE ⭕): This is true; fossil fuels and industry accounted for the largest share of cumulative emissions, exceeding 484 GtC out of the total 703 GtC tracked.

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Frequently Asked Questions about Greenhouse gas emissions