Autumn, season of the year between summer and winter during which temperatures gradually decrease. It is often called fall in the United States because leaves fall from the trees at that time. The concept of autumn is connected with the harvesting of crops; in many cultures autumn, like the other seasons, has been marked by rites and festivals revolving around the season’s importance in food production. Animals gather food in autumn in preparation for the coming winter, and those with fur often grow thicker coats. Many birds migrate toward the Equator to escape the falling temperatures.
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Earth Day was founded in 1970 as a day of education about environmental issues.The holiday is now a global celebration focused on green living and confronting the climate crisis.