Science.

“Climate change is not caused by human activity.”

The evidence directly contradicts the categorical denial of human causation. Major scientific assessments conclude that greenhouse-gas emissions and other human activities have caused essentially all observed global warming since the late 19th century, while natural influences alone cannot explain it. Uncertainty about attributing particular weather events does not weaken attribution of the global climate trend.

“Climate change is not real.”

Multiple independent measurements establish that Earth’s climate is changing. Temperature records, sea-level rise, ocean warming, and ice loss document the change, while attribution research shows that human greenhouse-gas emissions are the principal cause of recent warming. Evidence of natural climate shifts in the past reinforces, rather than refutes, the reality of climate change.

“Climate change is a primary cause of massive heatwaves in Europe.”

The evidence strongly supports climate change as a major driver of Europe’s most severe heatwaves. Authoritative assessments and attribution studies show human-caused warming has made such events much more likely and more intense, and some recent extremes would have been extremely unlikely without it. The caveat is that individual heatwaves are still triggered by specific weather patterns such as persistent high-pressure systems.

“Climate change is causing the geographic range of venomous snakes to expand.”

The evidence supports that climate change is driving geographic range shifts for venomous snakes, but the claim overstates the picture by implying a broad expansion. Peer-reviewed modelling studies project net range contractions for most venomous species, with only a medically significant subset gaining suitable habitat. The dominant scientific finding is redistribution — northward and to higher elevations — not a general expansion, making the unqualified claim materially incomplete.

“Emperor penguins face a very high risk of extinction primarily due to climate change.”

The IUCN officially reclassified emperor penguins as "Endangered" on April 9, 2026 — a category defined as facing "a very high risk of extinction in the wild" — with climate-driven sea ice loss explicitly identified as the primary threat. This determination is supported by BirdLife International, the British Antarctic Survey, peer-reviewed research, and observed population declines of 10–22% since 2009. The risk is projected over decades rather than representing imminent collapse, but the claim accurately reflects the current global scientific consensus.

“Rising nighttime temperatures caused by climate change are disrupting sleep patterns on a global scale.”

The claim is largely accurate. Multiple peer-reviewed systematic reviews and large-scale studies — including data from 68 countries — confirm that rising nighttime temperatures degrade sleep quality and quantity worldwide. However, the evidence primarily establishes strong associations rather than formal climate-attribution causation, and the effects are highly uneven: the elderly, women, lower-income populations, and those without air conditioning are disproportionately affected. The core message holds, but "global scale" somewhat overstates the uniformity of the disruption.

“Climate change increases the frequency of extreme weather events.”

The claim is largely accurate. The IPCC's AR6 assessment calls it an "established fact" that human-caused warming has increased the frequency and/or intensity of several major categories of extreme weather — particularly heat extremes, heavy precipitation, droughts, and compound events. However, the claim overgeneralizes: total hurricane counts are not clearly rising, and evidence for tornadoes and hail remains weak. The science supports "some extreme weather events are becoming more frequent," not a blanket increase across all types.

“Artificial intelligence will have a net positive impact on the climate.”

This claim overstates the certainty of AI's climate benefits. Leading authorities like the IEA and UNFCCC describe AI's potential emissions reductions as conditional — dependent on widespread adoption, smart governance, and clean energy supply. Meanwhile, AI-driven data center growth is already increasing emissions, with energy demand projected to reach ~1,050 TWh by 2026, much of it fossil-powered. AI could be net positive for the climate under the right conditions, but the unconditional claim that it will be is not supported by current evidence.

“The number of avalanches in the Alps has increased significantly in 2026 compared to previous years, and this increase is attributed to climate change.”

The claim is not supported by the available evidence. No Alps-wide data shows a significant increase in avalanche numbers in 2026. The only quantitative indicator — roughly 105 fatalities in the 2025–26 season — is described by official sources as in line with the long-term average of ~100. The strongest peer-reviewed research on Alpine avalanches and climate change projects a net reduction in total avalanche activity under warming, with only a compositional shift toward more wet-snow events. The claim overstates both the trend and the attribution.

“Planting a large number of trees is the most effective immediate solution to climate change.”

This claim is false. While tree planting is a valuable part of climate strategy, calling it the "most effective immediate solution" is contradicted by overwhelming scientific evidence. Studies in Nature Climate Change and from NASA show that all reforestation potential over 30 years would offset less than one year of global emissions. Trees take decades to store substantial carbon — the opposite of "immediate." The scientific consensus is clear: reducing fossil fuel emissions is far more effective and remains the essential priority.

“Human activity is the primary driver of observed climate change since the mid-20th century.”

This claim is true. The world's leading scientific institutions — including the IPCC, NASA, NOAA, and the National Academies — independently confirm that human greenhouse gas emissions are the primary driver of observed warming since the mid-20th century. Quantitative attribution studies show human activity caused approximately 1.07°C of warming, while natural factors (solar, volcanic) contributed only –0.1°C to +0.1°C. A small number of low-authority dissenting sources exist but provide no peer-reviewed evidence that overturns this conclusion.