Are humans responsible for climate change?

I will check the latest scientific consensus from authoritative sources.I am fetching a couple of key pages for direct quotes and details.Yes, humans are the primary cause of the recent observed climate change (global warming), according to the overwhelming scientific consensus.[1]

The Intergovernmental Panel on Climate Change (IPCC), in its Sixth Assessment Report (AR6), states: “It is unequivocal that human influence has warmed the atmosphere, ocean and land.” Human activities, principally through emissions of greenhouse gases (especially CO₂ from burning fossil fuels, plus methane, nitrous oxide, and others from industry, agriculture, and land-use changes), have caused global surface temperature to rise about 1.1°C above 1850–1900 levels (as of 2011–2020). The best estimate of human-caused warming from 1850–1900 to 2010–2019 is 1.07°C.[2]

Scientific Consensus

•Multiple independent studies of peer-reviewed literature find that 97% to over 99.9% of climate scientists and climate-related papers agree that humans are the main cause of recent warming. A 2021 analysis of over 88,000 papers found greater than 99% consensus.[3]

•Leading scientific organizations worldwide (NASA, NOAA, AAAS, American Geophysical Union, National Academies of Sciences, and nearly 200 others) endorse this position. For example, NASA states that climate-warming trends over the past century are extremely likely due to human activities.[1]

Key Evidence

1.Rising Greenhouse Gases: Atmospheric CO₂ has increased nearly 50% since 1750 (from ~280 ppm to over 410–420 ppm recently), primarily from fossil fuel combustion and deforestation. Isotopic analysis confirms the human (fossil) origin. Methane and nitrous oxide have also risen dramatically due to human activities. These gases trap heat via the enhanced greenhouse effect.[4]

2.Observed Warming Matches Human Influence:

•Global temperatures have risen ~1.1°C, with most warming since the mid-20th century. The rate is unprecedented in at least the last 2,000 years.

•Climate models reproduce the observed warming only when human greenhouse gas emissions (and other anthropogenic factors like aerosols) are included. Simulations with only natural factors (solar variability, volcanoes, internal variability) show little to no warming or even slight cooling.[5]

•Patterns match expectations for greenhouse gases: warming in the lower atmosphere (troposphere) and cooling in the upper atmosphere (stratosphere); more warming over land than oceans; Arctic amplification; etc.

3.Other Indicators: Ocean heat content has increased (oceans absorb most excess heat); sea levels are rising; glaciers and ice sheets are losing mass; Arctic sea ice is declining; extreme heat events are more frequent. Human influence is the main driver of many of these changes.[6]

Natural factors (solar output, orbital cycles, volcanoes, internal variability like El Niño) have always influenced climate and continue to do so on various timescales. However, they cannot explain the magnitude, rate, or pattern of warming since the Industrial Revolution—particularly the rapid rise since the mid-1900s. Solar irradiance has been stable or slightly declining while temperatures rose sharply.[4]

In short, while Earth’s climate has changed naturally throughout its history, the current rapid warming is overwhelmingly driven by human greenhouse gas emissions. This conclusion is based on multiple independent lines of evidence from observations, paleoclimate records, basic physics, and modeling, and it has strengthened over decades of research.

Citations (6)

1nasa.govGovernment
https://science.nasa.gov/climate-change/scientific-consensus/
Backs: “I will check the latest scientific consensus from authoritative sources.I am fetching a couple of key pages for direct quotes and details.Yes, humans are the primary cause of the recent observed climate change (global warming), according to the overwhelming scientific consensus.”
2ipcc.chGovernment
https://www.ipcc.ch/report/ar6/syr/longer-report/
Backs: “rise about 1.1°C above 1850–1900 levels (as of 2011–2020).”
3cornell.eduAcademic
https://news.cornell.edu/stories/2021/10/more-999-studies-agree-humans-caused-climate-change
Backs: “Multiple independent studies of peer-reviewed literature find that 97% to over 99.9% of climate scientists and climate-related papers agree that humans are the main cause of recent warming. A 2021 analysis of over 88,000 papers found greater than 99% consensus.”
4nasa.govGovernment
https://science.nasa.gov/climate-change/causes/
Backs: “Methane and nitrous oxide have also risen dramatically due to human activities.”
5ipcc.chGovernment
https://www.ipcc.ch/report/ar6/wg1/downloads/faqs/IPCC_AR6_WGI_FAQ_Chapter_03.pdf
Backs: “Simulations with only natural factors (solar variability, volcanoes, internal variability) show little to no warming or even slight cooling.”
6nasa.govGovernment
https://science.nasa.gov/climate-change/evidence/
Backs: “Other Indicators: Ocean heat content has increased (oceans absorb most excess heat); sea levels are rising; glaciers and ice sheets are losing mass; Arctic sea ice is declining; extreme heat events are more frequent.”