The document discusses global warming and findings from the Intergovernmental Panel on Climate Change (IPCC). Key points include: - Direct observations show unequivocal warming of the climate system through rising air and ocean temperatures, melting ice and snow, and rising sea levels. - Various changes have been observed on continental, regional and ocean basin scales including changes in Arctic temperatures, precipitation amounts, ocean salinity and extreme weather. - Global temperatures are rising faster in recent decades and the warmest years on record have all occurred since 1990. Arctic warming is double the global average. - Greenhouse gas concentrations are far above pre-industrial levels due to human activity. Most warming since 1950 is