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Hello everybody, I'm astronaut Chris Cassidy on board

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the International Space Station.

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Happy 50th Earth Day!

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(music)

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Earth Day, to me,

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is a time when it's very appropriate

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and applicable to reflect on

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how important Earth is to all of us.

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What does that mean to me?

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To me, it means Earth is our home.

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Earth is a spaceship for all of us.

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We're all astronauts on board that same ship.

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We need to take care of it.

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Like Anatoli, Ivan and myself, we're taking care of

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the International Space Station right now and if we don't do our job,

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the mechanical equipment won't work well

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and we could do damage to the space station, just like

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all of the people on Earth need to do their job, do their part, to keep Earth healthy.

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Simply put, it's a time to reflect on what you can do