openai (gpt-5-nano-2025-08-07) · contradicted · 95%

The claim is contradicted by extensive, long-standing scientific evidence that climate change is real and largely driven by human emissions; it has not been invented in the last decade.

Key points: Global average surface temperature has risen roughly 1.1–1.2°C since the late 19th century, with most warming occurring in recent decades. | The primary driver is increased atmospheric greenhouse gases from human activities (burning fossil fuels, deforestation, industrial processes). | Independent lines of evidence include ocean heat content, melting glaciers and ice sheets, and rising global sea level. | There is strong scientific consensus (e.g., IPCC, national academies) that climate change is real and human-caused; the claim of a 'hoax' is not supported by credible evidence. | The conclusion reflects current understanding; if future robust evidence emerged, scientific assessments would be updated, but as of 2026 the hoax claim remains unsupported.

anthropic (claude-haiku-4-5-20251001) · contradicted · 99%

The claim that climate change is a hoax invented in the last decade is factually inaccurate. Climate change science has been developed over more than a century, with extensive peer-reviewed research and institutional recognition spanning decades.

Key points: Scientific observations of greenhouse gases and their warming effects date back to the 1800s (Fourier, Tyndall, Arrhenius) | Modern climate science emerged in the 1950s-1960s with systematic atmospheric measurements | The Intergovernmental Panel on Climate Change (IPCC) was established in 1988 and published its first assessment report in 1990 | Consensus on anthropogenic climate change developed through the 1990s-2000s, based on multiple lines of evidence | Major scientific organizations worldwide (NASA, NOAA, national academies of science) have documented climate change for decades | The claim misrepresents both the timeline and the nature of climate science as a research field

Limitations: The claim uses vague language ('hoax,' 'invented') that could be interpreted different ways, though the core assertion is clearly false | Some debate exists about specific projections or policy responses, but not about the basic scientific reality of climate change | The evaluator is assessing the factual basis as of the claim reveal date (2026-02-10)

google (gemini-2.5-flash-lite) · contradicted · 100%

The claim that climate change is a hoax invented in the last decade is factually inaccurate. Scientific consensus and extensive evidence demonstrate that climate change is a real phenomenon with origins and study dating back much further than the last decade.

Key points: The scientific understanding of the greenhouse effect and its relation to atmospheric gases dates back to the 19th century. | The Intergovernmental Panel on Climate Change (IPCC) was established in 1988 to assess the scientific, technical, and socio-economic information relevant to understanding climate change. | Numerous peer-reviewed scientific studies published over decades have provided overwhelming evidence for human-caused climate change. | Global average temperatures have been rising measurably for over a century, with significant acceleration in recent decades.

Limitations: The claim's assertion of a recent invention is directly contradicted by historical scientific records and the long-standing nature of climate science research. | The term 'hoax' is subjective and not a factual descriptor that can be empirically verified or refuted in this context; the focus is on the factual inaccuracy of the timeframe and the existence of climate change.