Quote
"[A]ssessments that examine only the next 100 years may well underestimate the magnitude of the eventual impacts."
"Model experiments show that even if all radiative forcing agents were held constant at year 2000 levels, a further warming trend would occur in the next two decades at a rate of about 0.1°C per decade, due mainly to the slow response of the oceans. About twice as much warming (0.2°C per decade) would be expected if emissions are within the range of the SRES scenarios."

There is scientific consensus that the Earth has been consistently warming since the start of the Industrial Revolution, that the rate of recent warming is largely unprecedented, and that this warming is mainly the result of a rapid increase in atmospheric carbon dioxide (CO2) caused by human activities. The human activities causing this warming include fossil fuel combustion, cement production, a
"[A]ssessments that examine only the next 100 years may well underestimate the magnitude of the eventual impacts."
"[R]isk increases with increases in both the rate and the magnitude of climate change."
"The IPCC is now 95 percent certain that humans are the main cause of current global warming."
"[T]he more human activities disrupt the climate, the greater the risks of severe, pervasive and irreversible impacts for people and ecosystems, and long-lasting changes in all components of the climate system."
"[This report] calls for the urgent attention of both policymakers and citizens of the world to tackle this challenge."
"[H]eat stress and smog induced respiratory illnesses in major urban areas would increase, if no adaptation occurred."