Direct measurements, such as ______, indirect measurements, and ______ based on scientists' understanding of how Earth's six spheres interact provide us with the information used to document climate change.
In order to understand the earth and its climatic patterns, we need to have a deeper understanding of how the system of the earthworks and for that six spheres provides us with an adequate amount of information for documentation of climate change.
The direct sources of data are modern climatic records and the indirect is the past and old climatic data that ay or may not be connected directly.
