00:00Famous landmarks around the world went dark on Saturday to raise awareness of environmental issues.
00:06They did so as part of a global campaign called Earth Hour, which is now in its 20th year.
00:11Earth Hour encourages people everywhere to take an hour to think how they can make a positive impact for the
00:17sake of the planet.
00:19Monuments that took part this year included the Eiffel Tower in Paris, the Brandenburg Gate in Berlin, and the Acropolis
00:25in Athens.
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