I'll gather the current science on humans' role in climate change.
Yes, according to overwhelming scientific evidence and consensus.
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.
•Multiple independent analyses of the peer-reviewed literature and surveys of climate experts put agreement that humans are causing recent warming at roughly 97% or higher
•NASA summarized: "A consensus on climate change and its human cause exists. Multiple studies published in peer-reviewed scientific journals show that human activities are the primary cause of the observed climate-warming trend over the past century."
Conclusions of Major Scientific Bodies
•The Intergovernmental Panel on Climate Change (IPCC), a scientific body established by the United Nations, has concluded that it is "extremely likely" that human activities are the dominant cause of global warming observed since the mid-20th century.
•The IPCC reports in its foreword that "the IPCC is now 95 percent certain that humans are the main cause of current global warming.
•NASA states: There is unequivocal evidence that Earth is warming at an unprecedented rate. Human activity is the principal cause.
•NOAA Climate.gov: "Yes, by increasing the abundance of greenhouse gases in the atmosphere, human activities are amplifying Earth's natural greenhouse effect. Virtually all climate scientists agree that this increase in heat-trapping gases is the main reason for the 1.8°F (1.0°C) rise in global average temperature since the late nineteenth century".
Extent of Human Contribution
•Humans emissions and activities have caused around 100% of the warming observed since 1950, according to the Intergovernmental Panel on Climate Change's (IPCC) fifth assessment report.
•The IPCC stated it is "extremely likely that more than half of the observed increase in global average surface temperature" from 1951 to 2010 was caused by human activity.
•NASA's Dr Gavin Schmidt has pointed out, the IPCC's implied best guess was that humans were responsible for around 110% of observed warming (ranging from 72% to 146%), with natural factors in isolation leading to a slight cooling over the past 50 years.
> A human contribution of greater than 100% is possible because natural climate change associated with volcanoes and solar activity would most likely have resulted in a slight cooling over the past 50 years, offsetting some of the warming associated with human activities.
How Humans Cause Warming
•The modern-day rise in global temperatures is driven by human activities, especially fossil fuel (coal, oil and natural gas) burning since the Industrial Revolution.
•Fossil fuel use, deforestation, and some agricultural and industrial practices release greenhouse gases.
•These gases absorb some of the heat that the Earth radiates after it warms from sunlight, warming the lower atmosphere.
•Carbon dioxide, methane, nitrous oxide, ozone, and various chlorofluorocarbons are all human-emitted heat-trapping gases.
•At present, humans are putting an estimated 9.5 billion metric tons of carbon into the atmosphere each year by burning fossil fuels, and another 1.5 billion through deforestation and other land cover changes.
Natural vs Human Factors
•The climate has always varied naturally due to factors such as solar energy changes, volcanic activity, and greenhouse gas fluctuations.
•However, the rapid warming observed since the mid-20th century is primarily driven by human activities, especially greenhouse gas emissions from burning fossil fuels.
•Over the past 50 years, solar energy reaching the Earth has actually declined slightly, while temperatures have increased dramatically.