Are humans responsible for climate change?

I'll gather the scientific evidence on humanity's role in climate change to answer your question.

Yes, according to the overwhelming scientific consensus, humans are responsible for recent climate change.

There is unequivocal evidence that Earth is warming at an unprecedented rate. Human activity is the principal cause.

The scientific consensus is that the Earth's climate system is unequivocally warming, and that it is extremely likely (meaning 95% probability or higher) that this warming is predominantly caused by humans.

Specifically:
> Yes, the vast majority of actively publishing climate scientists – 97 percent – agree that humans are causing global warming and climate change.

Leading science organizations around the world have issued public statements expressing this, including international and U.S. science academies and the United Nations Intergovernmental Panel on Climate Change (IPCC).

The IPCC has stated there is 95 percent certainty that humans have caused most of the warming of the planet's surface that has occurred since the 1950s.

In its Sixth Assessment Report (AR6), the IPCC concluded:

> It is unequivocal that human influence has warmed the atmosphere, ocean and land

This was described as the strongest statement that the IPCC has ever made, with the agreement of all 195 member countries, that it is unequivocal that human activity is causing climate change.

The IPCC AR6 concludes that 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.

Other reports found humans have been the primary driving force behind the global warming trend since the 1950s.

> Nearly all of this can be attributed to human influence. The IPCC found that the combined effects of human activity have already increased the global average temperature by about 1.1 degrees Celsius above the late 19th century average. The contribution to global warming of natural factors, such as the sun and volcanoes, is estimated to be close to zero.

> 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.

Human activities, especially emissions of CO2 and other greenhouse gases, are the primary cause of the global warming trend observed over recent decades.

Physical records show CO2 and other greenhouse gases have risen rapidly since the Industrial Revolution and that current rates of change exceed natural variability seen over the past 10,000–800,000 years, consistent with the known heat-trapping properties of those gases.

Specifically:

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. Since 1750, humans have increased the abundance of carbon dioxide in the atmosphere by nearly 50 percent.

While climate does change naturally due to factors like solar variations and volcanic activity, current scientific evidence, including direct observations, paleoclimate archives, and climate models, shows natural factors cannot explain the observed warming since the mid-20th century, whereas human greenhouse gas emissions can.