I hadn't realized it was based on concrete measurements of what the paleoclimates -- the ancient climates -- were, as recorded in the ice sheets, as recorded in deep ocean sediments, as recorded in lake sediments, tree rings, and a lot of other ways of measuring temperature.
実際はそれが、氷床や、海洋底の沈殿物や、 湖の沈殿物や、年輪やその他の 気温を測定する方法に基づいた「古気象」―古代の気象ーの 確固とした測定によるとは 知りませんでした