Tree rings are absolutely used as a proxy to infer the past, the science is called dendrochronology, and the application of it is called https://en.wikipedia.o

Tree rings are absolutely used as a proxy to infer the past, the science is called dendrochronology, and the application of it is called https://en.wikipedia.org/wiki/Dendroclimatology https://en.wikipedia.org/wiki/Dendroclimatology The limitations of it are known, and you won't find that the results of it are used for false claims by the real scientists: https://www.ipcc.ch/site/assets/uploads/2018/02/WG1AR5_Chapter05_FINAL.pdf https://www.ipcc.ch/site/assets/uploads/2018/02/WG1AR5_Chapt... What I'm posting above is the real report by the The Intergovernmental Panel on Climate Change. If you look in the context, tree rings are just one piece of the big and complex picture. See my other comment for an example how those who just try to confuse simply ignore (and don't even care for) geological facts when they try to push their agenda. The same happens with those who try to sell you the doubt and false claims about the state of climate research. The scientifically known uncertainties in using the tree rings as proxies aren't changing any facts about the reality of global warming. It's undeniable basic physics. CO2 makes the Earth surface warmer because it blocks the part of the spectrum that would otherwise allow it to cool off. The part of the spectrum of the Sun that warms the surface up is however not blocked by the CO2. So the Earth gets the same effect that you have when you cover yourself with a blanket. It's warmer under it. It's undeniable and we are observing the effects every day: https://tidesandcurrents.noaa.gov/publications/techrpt83_Global_and_Regional_SLR_Scenarios_for_the_US_final.pdf https://tidesandcurrents.noaa.gov/publications/techrpt83_Glo... If we don't do anything the expected sea rise on US shores is estimated up to 2.5 m higher (8 feet) in 2100. The non-red lines in the graphs are for the scenarios if the humanity actually stops pushing CO2 in the atmosphere very soon. We're already not following the "blue" strategies.