The IPCC (Intergovernmental Panel on Climate Change is the international body for assessing climate change's science. It currently has 195 members and was founded in 1988 by the WMO (World Meteorological Organisation and UNEP (United Nations Environment Programme).
The IPCC present projections of future climate change based on different scenarios and the risk that climate change poses, discussing the implications of response options.
The Enhanced Greenhouse affect is the impact on the climate from the additional heat retained due to the increased amounts of carbon dioxide and other green house gases that humans emit.
In 2019, atmospheric carbon dioxide concentration were higher than at any time in at least 2 millions years, and concentration of methane and nitrous oxide were higher than at any time in the last 800,000 years.
Global surface temperatures has increased faster since 1970 than in any other 50 year period over a least the last 2,000 years.
Human activities enhancing the greenhouse gas are responsible for 1.1 degree Celsius of warming 1850-1900.
The carbon budget is the finite of greenhouse gases we can emit to limit global temperatures rise to 2 degrees Celsius.