Is climate change real?

Yes, climate change is real. It refers to long-term shifts in temperatures and weather patterns, and the current episode of rapid global warming is primarily driven by human activities.[1]

Scientific Consensus

There is overwhelming agreement among climate scientists and major scientific organizations. Studies of peer-reviewed literature show that more than 99% of climate-related papers (and climate scientists) agree that climate change is happening and that human activity is the primary cause.[2][3]

Key Evidence

Multiple independent lines of evidence from instruments, satellites, ice cores, tree rings, and other paleoclimate records confirm warming and its human cause:

Climate has always varied naturally (e.g., ice ages driven by orbital changes, solar variability, volcanoes), but the current warming cannot be explained by natural factors alone. Solar output has been relatively stable or slightly declining in recent decades, while the pattern of warming (troposphere warming, stratosphere cooling) matches greenhouse gas forcing, not solar. Climate models that include human greenhouse gas emissions reproduce the observed warming; those without do not.[7]

Human Cause

Basic physics (the greenhouse effect, known since the 19th century) shows that CO₂ and other gases trap heat. Human emissions have disrupted the carbon cycle, driving the observed changes. Attribution studies (“fingerprinting”) confirm humans are responsible for essentially all the net warming since pre-industrial times.[4]

In short, the evidence is robust, multi-decadal, multi-method, and independently verified by agencies and researchers worldwide. While uncertainties remain about the precise magnitude of future regional impacts or tipping points, the reality of ongoing human-caused climate change is established scientific fact. For primary sources, see NASA’s climate pages, IPCC AR6 reports, and NOAA data.