NEWS: The task of the IPCC Abbreviation for Intergovernmental Panel on Climate Change also called the Intergovernmental Panel on Climate Change, is to provide regular reports on the current state of knowledge regarding climate change in order to provide governments at all levels with information that they can use to develop their climate policies.

To this end, the IPCC compiles current knowledge from all relevant areas of research and presents the causes, consequences and risks of climate change. It also identifies ways in which humankind can mitigate climate change and adapt to it. The IPCC does not conduct research itself, but summarises the statements of tens of thousands of publications in so-called assessment reports, the IPCC Assessment Reportsand special reports and evaluates them from a scientific perspective. These status reports summarise the results for policy makers.

On 9 August 2021, the first volume of the IPCC Sixth Assessment Report (AR6) of the Working Group (WG I) on the Scientific Basis of Climate Change was published. In the core team, 243 experts* from 66 countries, including seven from Germany, worked on the WG I contribution from summer 2018 to July 2021. The other reports are currently being prepared by the Working Groups on Climate Change Impacts, Vulnerability and Adaptation (WG II) and Mitigation (WG III) and will be published in 2022. The last version of the report (WG5) was from 2013.

The key messages of the report:

• Human influence has warmed the climate at a rate unprecedented for the last 2000 years. Human-induced climate change is already affecting many weather and climate extremes in all regions of the world. The changes we are experiencing will increase with further warming.
• Many changes in the climate system are becoming larger in direct relation to increasing global warming. These include increases in the frequency and intensity of heat extremes, marine heat waves and heavy precipitation, agricultural and ecological droughts in some regions, the proportion of violent tropical cyclones, and declines in Arctic sea ice, snow cover and permafrost. Climate change means more extreme weather for Germany as a whole, especially more heat waves. It is generally getting warmer, drier and the risk of fire is increasing. Apparently paradoxically, precipitation is also increasing, especially the risk of heavy rainfall. Another clear climate consequence is the rise in sea level, depending on the scenario, from 30 cm - 60 cm or from 60 cm - 1.00 m at the German coast by 2100. If the unstable Antarctic ice sheet melts, sea levels could rise by up to 1.60 m. All scenarios see a rise of 20 cm - 30 cm by 2050.
• Many changes due to past and future greenhouse gas emissions are irreversible over centuries to millennia, especially changes in the ocean, ice sheets and global sea levels. Future emissions cause additional warming in the future, with the total warming from past & future CO₂ emissions is dominated. Human activities influence all major components of the climate system, with some responding over decades and others over centuries.

Without an immediate, rapid and comprehensive reduction of greenhouse gas emissions, limiting warming to 1.5°C will not be achievable. In all scenarios, global warming will exceed 1.5 degrees Celsius in the next 20 years compared to the pre-industrial period with a probability of more than 50 percent, on average happening in the early 2030s. This is also true for the low emissions scenarios, where warming is limited to about 1.5 degrees Celsius in the long term. Compared to the IPCC special report on 1.5 degrees Celsius global warming published in 2018, this overshoot is now projected ten years earlier.

CO₂ concentrations in the atmosphere have already risen to 410 parts per million (ppm) by 2019 (from 313 ppm when measurements began at Mauna Loa, Hawaii in 1958) - unprecedented for at least two million years. Global surface temperature has warmed by an average of about 1.09 degrees Celsius from 2011 to 2020 compared to pre-industrial times, and each of the past four decades has been warmer than any previous decade since 1850.

The MuP Group is helping to achieve compliance with climate targets as part of "Engineering for a Better Tomorrow". Through M&P GO.BLUE.NOW, the limitation of global warming to 1.5° is pursued together with customers and partners.

Sources:

• to the communication
• https://www.de-ipcc.de/media/content/Hauptaussagen_AR6-WGI.pdf
• https://www.de-ipcc.de/media/content/AR6_PPT_SPM_Folien_DE_Eyring_Marotzke_PK_BMU_BMBF.pdf

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