The burning of fossil fuels like coal, oil and gas has increased carbon dioxide (CO2) in Earth’s atmosphere. Our industrial activities have raised atmospheric CO2 levels by nearly 50% since 1750. We know this increase is due to human activities, because scientists can identify a distinctive isotopic fingerprint in the atmosphere. Clearing land for agriculture, industry, and other human activities has contributed to increased levels of greenhouse gas.
In its March 2023 Report, the UN Intergovernmental Panel on Climate Change concluded thatit is unequivocal that the increase of CO2, methane, and nitrous oxide in the atmosphere is the result of human activities, and that human influence is the principal driver of many changes observed across the atmosphere, ocean, cryosphere and biosphere. While the Sun has played a role in past climate changes, the evidence shows the current warming cannot be explained by the Sun. Source: NASA