— Ch. 1 · The Clockwork Of Release —
IPCC Sixth Assessment Report.
~5 min read · Ch. 1 of 7
On the 9th of August 2021, a document titled Climate Change 2021: The Physical Science Basis landed on desks across the globe. This report marked the first installment of the Sixth Assessment Report from the Intergovernmental Panel on Climate Change. It arrived after years of preparation involving 234 scientists hailing from 66 different countries. These experts drew upon more than 14,000 scientific papers to construct a massive text spanning 3,949 pages. Governments representing all 195 member states then spent five days line-by-line approving the Summary for Policymakers before its final release.
The schedule continued with deliberate precision throughout the following year. A second volume focusing on impacts and adaptation emerged in February 2022. A third section detailing mitigation strategies followed shortly thereafter in April 2022. The entire process concluded when the Synthesis Report was finalized during the 58th plenary meeting held in Interlaken. That final document appeared on the 20th of March 2023 and served as the primary reference for the COP28 conference in Dubai later that same month.
The Physics Of Warming
Scientists established that human activities have unequivocally caused global warming since the pre-industrial era. Global surface temperatures reached 1.1 degrees Celsius above the 1850, 1900 average between 2011 and 2020. The report quantified climate sensitivity at approximately 3 degrees Celsius for every doubling of atmospheric carbon dioxide. This figure represents the best estimate among a range of possibilities stretching from lower to higher values.
Projections indicate that the world will likely exceed the 1.5 degree threshold under current emission scenarios. The global carbon budget required to stay below this limit amounts to roughly 500 billion tonnes of greenhouse gases starting from 2020. Achieving a 67 percent chance of staying within this boundary reduces the allowable emissions to 400 billion tonnes. An 83 percent probability shrinks the remaining allowance further to just 300 billion tonnes. Sea levels are projected to rise by half to one meter by the year 2100, though two to five meters remains a possibility if ice sheet instability accelerates.