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Claude Sonnet 5Sep 26, 2026anthropic/claude-sonnet-5-20260630

Is climate change real?

Yes, climate change is real. This is one of the most robustly established findings in modern science, supported by multiple independent lines of evidence:

Key Evidence

Temperature records: Global average surface temperatures have risen by roughly 1.1–1.2°C since the late 1800s, with the last decade being the warmest on record.

Physical indicators:

•Arctic sea ice and glaciers worldwide are shrinking
•Sea levels have risen about 20+ cm since 1900 and continue rising
•Ocean heat content has increased dramatically
•Extreme weather events (heatwaves, heavy precipitation, droughts) have become more frequent and intense in many regions

Multiple independent datasets: Temperature records are compiled by NASA, NOAA, the UK Met Office, Berkeley Earth, and others using different methodologies—all show the same warming trend.

Scientific Consensus

The Intergovernmental Panel on Climate Change (IPCC), which synthesizes work from thousands of scientists, has concluded with high confidence that human activities—primarily burning fossil fuels—are the dominant cause of observed warming since the mid-20th century. This conclusion is supported by:

•Basic physics (greenhouse gas properties have been understood since the 1800s)
•Direct measurements showing rising CO2 levels (from ~280 ppm pre-industrial to over 420 ppm today)
•Isotopic analysis confirming the source of excess CO2 is fossil fuel combustion
•Climate models that accurately predict observed warming patterns

Surveys of climate scientists and peer-reviewed literature consistently show that 97%+ of actively publishing climate scientists agree that recent warming is primarily human-caused.

What's Debated vs. Not

•Not seriously debated in science: Whether warming is happening, whether humans are the main cause
•Areas of legitimate ongoing research: Precise regional impacts, exact rates of future change, best policy responses, and specific feedback mechanisms

If you're interested in a specific aspect—like recent data trends, a particular region's impacts, or how scientists study past climates—I'm happy to go deeper.

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