More answers like this
GPT-5Oct 2, 2026openai/gpt-5-2025-08-07
Are humans responsible for climate change?
Yes. The evidence is overwhelming that humans are the primary cause of the recent, rapid warming of Earth’s climate.
Why scientists are confident:
•Greenhouse gases from burning fossil fuels, deforestation, and industry have risen sharply, trapping more heat. CO2 levels are now far above preindustrial values.
•The added CO2 has a fossil-fuel “fingerprint” (isotope ratios and a measured decline in atmospheric oxygen) showing it comes from burning carbon.
•The observed pattern of change matches greenhouse-gas warming: the lower atmosphere warms while the stratosphere cools; nights and winters warm faster than days and summers; the Arctic warms more than the tropics.
•Oceans are gaining heat and sea levels are rising, confirming a global energy imbalance.
•Climate models only reproduce the observed warming since the mid‑20th century when human influences are included; natural factors alone (solar changes, volcanoes) can’t explain it.
In short: natural factors affect climate, but the warming over the last several decades is driven predominantly—indeed, essentially entirely—by human activities.