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Claude Sonnet 5Oct 21, 2026anthropic/claude-sonnet-5-20260630
Is climate change real?
Yes, climate change is real and is supported by an overwhelming body of scientific evidence. Here's a summary of what we know:
Evidence that climate change is happening:
•Global average surface temperatures have risen significantly since the late 19th century, with most of that warming occurring in recent decades.
•Ocean temperatures are rising, and oceans are absorbing much of the excess heat.
•Glaciers and ice sheets (Greenland, Antarctica) are losing mass, and Arctic sea ice is shrinking.
•Sea levels are rising due to melting ice and thermal expansion of water.
•Extreme weather events—heatwaves, heavy precipitation, droughts, and stronger storms—have become more frequent or intense in many regions.
•Ocean acidification is increasing as oceans absorb more CO2.
Evidence that human activity is the primary cause:
•The concentration of greenhouse gases like CO2 and methane in the atmosphere has increased dramatically since the Industrial Revolution, correlating with fossil fuel use, deforestation, and industrial activity.
•Scientific organizations worldwide—including NASA, NOAA, the IPCC (Intergovernmental Panel on Climate Change), and national academies of science from numerous countries—have concluded that human activities, particularly the burning of fossil fuels, are the dominant driver of observed warming since the mid-20th century.
•There is strong scientific consensus (based on multiple independent studies) that over 97% of actively publishing climate scientists agree that recent warming is primarily human-caused.
Why this matters:
Climate change has wide-ranging effects, including impacts on agriculture, water resources, ecosystems, public health, and increased risks from extreme weather events.
If you're interested in more specific data—like recent temperature records, policy responses, or regional impacts—I can look up current information for you.