As a matter of fact, corals themselves provide a lot of historical data in a manner similar to tree growthrings: https://www.ncdc.noaa.gov/news/picture-climate-

As a matter of fact, corals themselves provide a lot of historical data in a manner similar to tree growthrings: https://www.ncdc.noaa.gov/news/picture-climate-how-we-can-learn-corals https://www.ncdc.noaa.gov/news/picture-climate-how-we-can-le...