"Surface temperatures will remain approximately constant at elevated levels for many centuries after a complete cessation of net anthropogenic CO2 emissions. A large fraction of anthropogenic climate change resulting from CO2 emissions is irreversible on a multi-century to millennial timescale, except in the case of a large net removal of CO2 from the atmosphere over a sustained period."
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
"(SRM) involves large-scale methods... is untested and is not included in any of the mitigation scenarios. If it were deployed, SRM would entail numerous uncertainties, side effects, risks and shortcomings... If it were terminated [after and if once begun], there is high confidence that surface temperatures would rise very rapidly impacting ecosystems..."
Scientific consensus on climate change"[A]ssessments that examine only the next 100 years may well underestimate the magnitude of the eventual impacts."
Scientific consensus on climate change"[R]isk increases with increases in both the rate and the magnitude of climate change."
Scientific consensus on climate change"It is virtually certain that there will be more frequent hot and fewer cold temperature extremes over most land areas on daily and seasonal timescales, as global mean surface temperature increases."
Scientific consensus on climate change"Many of the observed changes since the 1950s are unprecedented over decades to millennia."
Scientific consensus on climate change"There are multiple mitigation pathways that are likely to limit warming to below 2°C relative to pre-industrial levels. These pathways would require substantial emissions reductions over the next few decades and near zero emissions of CO2 and other long-lived greenhouse gases by the end of the century."
Scientific consensus on climate change