"Warming of the climate system is unequivocal, as is now evident from observations of increases in global average air and ocean temperatures, widespread melting of snow and ice and rising global average sea level."
지난 100년 동안 지구 평균 기온은 0.8 °C 상승했으나, 지구 온난화로 인해 30년 동안 평균 기온이 0.6 °C 상승했다.  "Warming of the climate system is unequivocal, as is now evident from observations of increases in global average air and ocean temperatures, widespread melting of snow and ice and rising global average sea level."