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| A session on light pollution and its effects on the 22nd May 2012. |
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| Public lighting shining towards the sky: waste of energy and bad effect for people observing the night sky. |
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| Public lighting shining towards the ground: best sollution because it saves energy and allows people to observ the night sky close to the cities. |
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| Teacher Isadora Gírio, a member of the Night Sky Rangers Program, explaining light pollution and its effects to our class. |
