I'll gather the current science on humans and climate change.
Yes, humans are responsible for modern climate change — this is the overwhelming conclusion of climate science.
Scientific Consensus
•Scientific consensus identifying humans as primarily responsible for climate change was already forming in the 1980s. Today, 97 percent to 99.9 percent of climate scientists agree that climate change is happening and that human activity is the primary cause.
•More specifically: "Yes, the vast majority of actively publishing climate scientists – 97 percent – agree that humans are causing global warming and climate change". This includes international and U.S. science academies, the United Nations Intergovernmental Panel on Climate Change, and other reputable scientific bodies.
•Surveys of the literature find similar results: A 2019 review found consensus at 100% and a 2021 study concluded over 99% of scientific papers agree on the human cause of climate change.
What Leading Scientific Bodies Say
•NASA: "There is unequivocal evidence that Earth is warming at an unprecedented rate. Human activity is the principal cause."
•IPCC: The IPCC Sixth Assessment Report (AR6, 2021) concludes: “It is unequivocal that human influence has warmed the atmosphere, ocean, and land.”
•Earlier IPCC assessments phrased it as:
•"There is new and stronger evidence that most of the warming observed over the last 50 years is attributable to human activities."
•"It is extremely likely that human influence has been the dominant cause of the observed warming since the mid-twentieth century."
•In the Fifth Assessment Report (2013) the IPCC said there is 95 percent certainty that humans have caused most of the warming of the planet's surface that has occurred since the 1950s — up from 90 percent certainty in 2007.
The IPCC AR6 concludes it is unequivocal that humans have caused the earth's climate to warm, with a likely human contribution of 0.8 to 1.3 degrees Celsius to global mean temperature since the late 1800s.
Evidence Linking Human Activity to Warming
•"Changes observed in Earth's climate since the mid-20th century are driven by human activities, particularly fossil fuel burning, which increases heat-trapping greenhouse gas levels in Earth's atmosphere, raising Earth's average surface temperature".
•The planet's average surface temperature has risen by at least 1.1 degree Celsius since preindustrial levels of 1850–1900 — because people are loading the atmosphere with heat-trapping gases produced during the burning of fossil fuels.
•Concentrations of the key greenhouse gases have all increased since the Industrial Revolution due to human activities. Carbon dioxide, methane, and nitrous oxide concentrations are now more abundant than any time in the last 800,000 years.
•Burning fossil fuels changes the climate more than any other human activity. Other human sources include clearing land for agriculture, deforestation, and other activities that increase concentrations of greenhouse gases.
Natural factors like volcanic activity and changes in solar output do drive atmospheric change, but they do not account for the recent rapid rise in global temperatures caused by human activities like fossil fuel burning. Natural sources of climate variability are significant, but multiple lines of evidence — direct observations, paleoclimate archives, theoretical studies and climate models — indicate that human influences have had an increasingly dominant effect since the mid-twentieth century.