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Twenty thousand years of massive volcanic eruptions doubled the level of carbon dioxide (CO2) in Earthâ€™s atmosphere 200 million years ago.
Word of the Day
- Any of various tropical Old World birds of the family Indicatoridae, some species of which lead people or animals to the nests of wild honeybees. The birds eat the wax and larvae that remain after the nest has been destroyed for its honey.
Honeyguide birds have even been known to eat candles.