Are humans responsible for climate change?

I will consult reliable scientific sources to answer this.To provide a complete picture, I'll review the key IPCC and NASA pages directly.Yes, humans are the primary cause of the observed climate change (global warming) since the Industrial Revolution, particularly the rapid warming of recent decades. This is the overwhelming conclusion of climate science, based on multiple independent lines of evidence.[1]

Scientific Consensus

The Intergovernmental Panel on Climate Change (IPCC), which synthesizes the work of thousands of scientists worldwide, states in its Sixth Assessment Report (AR6, 2021):
> “It is unequivocal that human influence has warmed the atmosphere, ocean and land. Widespread and rapid changes in the atmosphere, ocean, cryosphere and biosphere have occurred.”[1]

It further notes that observed increases in well-mixed greenhouse gases (GHGs) like CO₂, methane, and nitrous oxide since around 1750 “are unequivocally caused by human activities,” and that human influence is the principal driver of many observed changes.[1]

Key Evidence

Multiple lines of evidence converge on this conclusion:

NASA, NOAA, and other agencies summarize the same points: Earth’s average surface temperature has risen about 1.1°C (roughly 2°F) since the late 19th century, with the bulk driven by human expansion of the greenhouse effect.[7]

Natural Climate Variability Still Exists

Climate has always varied due to orbital cycles, solar changes, volcanoes, and internal ocean-atmosphere oscillations. These continue to influence year-to-year and decade-to-decade weather (e.g., El Niño years are warmer). However, over multi-decadal timescales relevant to long-term climate change, human forcing now dominates. The recent warming is superimposed on, and far exceeds, these natural fluctuations.[5]

In short, the scientific evidence is robust, multi-faceted, and has strengthened over decades of research. Human activities—chiefly GHG emissions from fossil fuels—are responsible for the bulk of observed modern climate change.