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1898 — Swedish scientist Svante Ahrrenius calculates that CO2 from coal and oil burning will warm the planet.
1955 — U.S. scientist Charles Keeling finds atmospheric CO2 has risen to 315 parts per million.
1971 — First international conference on climate change is held in Sweden.
1986 — Atmospheric CO2 reaches 350 ppm.
1988 — NASA scientist James Hansen tells U.S. Congress global warming "is already happening now."
1988 — U.N. creates the Intergovernmental Panel on Climate Change (IPCC), a clearinghouse for climate science.
1990 — IPCC issues its First Assessment Report, noting Earth is warming.
1992 — Climate treaty sets voluntary goals to lower CO2 and other greenhouse gas emissions.
1995 — IPCC's Second Assessment Report says the "balance of evidence suggests a discernible human influence on global climate."
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animations & interactives
- County-by-county carbon emissions
- Climate future: Steps some countries are taking
- Results of AP-Stanford poll on global warming
- Climate conference draws eclectic mix of humanity
- Climate conference: Nations to set new goals
- Climate change: Key dates in global warming
- Global warming: Cities vulnerable to rising waters
- Green Remodeling: New, rediscovered in demand
- Eco-dilemmas: Tough choices for consumers
- Fit and Green: Shed pounds, help the Earth
- China: Too much trash
- The northern front: A forewarning of changes
- Contaminated water: Children exposed at school
- Pharmaceuticals in the Water
- SFgate.com: You decide who gets California's water
