Explain the sources of palaeoclimatic data.

Paleoclimatology data are derived from natural sources such as tree rings, ice cores, corals, and ocean and lake sediments. These proxy climate data extend the archive of weather and climate information hundreds to millions of years. The data include geophysical or biological measurement time series and some reconstructed climate variables such as temperature and precipitation.

NCEI provides the paleoclimatology data and information scientists need to understand natural climate variability and future climate change. We also operate the World Data Service for Paleoclimatology, which archives and distributes data contributed by scientists around the world.

It must be noted that for studying modern climate, the climatologists (alsoknown as climate scientists) can get a century old data. Can you thinkthis data is sufficient to know the climate of the whole Earth, which isnearly 4.6 billion ____ _____ _________ ________ ___ ___ ________ ___ ______ __________ _______ _____.
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