The first Arbor Day in the US was held in 1872. Since then, the event has really taken root. On the last Friday of April, people across the country mark the occasion by planting trees, often dedicating them to a loved one. It"s also a great day to celebrate trees themselves. As well as providing homes for countless species of animals, trees absorb carbon dioxide and clean the air we breathe. They also help to keep cities cooler and can even play a role in preventing floods.
Arbor Day
Today in History
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					Earth at Perihelion
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					Celebrating the Day of the Dead
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					All is silent for Big Ben’s musical milestone
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					Bird s-eye view on World Environment Day
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					National Park Service Founders Day
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					Siblings Day
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					Penn Station
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					Vacuum Chamber 5 at Glenn Research Center
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					Swim city
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					‘You should see the one that got away!’
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					The Crown of the Continent
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					National Park Week begins
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					It’s surströmming time
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					Martin Luther King Jr. Day
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					World Migratory Bird Day
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					Thick-billed raven, Simien Mountains, Ethiopia
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					Over and under the delta
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					Boxing Day in East Yorkshire, England
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					Back on the rise
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					La Rocque Harbour, Island of Jersey
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					Ancient til trees in Fanal Forest, Madeira, Portugal
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					Old man s whiskers growing wild
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					World Nature Conservation Day
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					Dhaka, Bangladesh
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					Tiny fliers head south
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					American bison, Grand Teton National Park, Wyoming
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					Sea lion in a kelp forest, Baja California, Mexico
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