Paleoclimatologists use a variety of methods from Earth and life sciences to obtain data previously preserved within rocks, sediments, boreholes, ice sheets, tree rings, corals, shells, and microfossils. Combined with techniques to date the proxies, these paleoclimate records are used to determine the past states of Earth's atmosphere.
Explanation: The study of ancient climates helps us understanding how the climate system works--and how it might change in the future. Geologic records going back millions of years show that natural patterns, like shifts in Earth's orbit, can steer dramatic changes.
The two most obvious ones are on the far right, and near the far left. Oceanic lithosphere is descending into the earth's mantle at these places, and being destroyed. ... At convergent boundaries oceanic lithosphere is always destroyed by descending into a subduction zone
