Paleoclimatology is the study of climate prior to the availability of recorded data. It is studied similar to that of archeologists, but instead of using dinosaur and fossils, this data is collected through footprints left by the environment about past climates and climate trends over the years. It is important to study mainly, because we need to learn if the climate changes that we have been able to study are due to natural variations over time or whether we as humans are affecting the climate negatively.
Sources used:
http://www.ncdc.noaa.gov/paleo/primer.html
http://earthobservatory.nasa.gov/Features/Paleoclimatology/paleoclimatology_intro.php
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