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Greta Thunberg (left), 16-year-old climate activist from Sweden, joins young climate activists in a FridaysForFuture protest in front of the UN Headquarters.
The United Nations commemorates Earth Hour by turning off the lights at UN Headquarters and other buildings around the world. Earth Hour is a global initiative commemorated annually on the last Saturday of March to focus attention on people-driven solutions to protect the planet and build a sustainable future.

A view of a dark Secretariat Building and the New York City skyline from across the East River.
Secretary-General António Guterres observes the haze due to smoke from Canadian wildfires from his office at UN Headquarters.
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Unique ID UN7ALB50463 
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Energy in the 21st Century: The Alternatives 
01/01/1981 15:57:28 
Unique ID UN7475102 
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Energy in the 21st Century / the Alternatives 
01/01/1980 16:58:10 
Unique ID UN7771613 
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Energy in the 21st Century / the Alternatives 
01/01/1980 16:00:05 
Unique ID UN7771614 
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Energy in the 21st Century / The Alternatives 
06/01/1981 15:59:00 
Unique ID UN7771615 
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Energy in the 21st Century: The Alternatives 
06/01/1981 09:15:10 
Unique ID UN7543266 
c77.jpg
Energy in the 21st Century: The Alternatives 
01/01/1981 12:58:15 
Unique ID UN7558369 
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Energy in the 21st Century: The Alternatives 
01/01/1981 09:33:52 
Unique ID UN7558361 
c78.jpg
Energy in the 21st Century / the Alternatives 
01/01/1981 15:57:32 
Unique ID UN7771619 
c6d.jpg
Energy in the 21st Century / the Alternatives 
01/01/1981 11:34:01 
Unique ID UN7771608 
e4c.jpg
Energy in the 21st Century / the Alternatives 
01/01/1981 12:02:28 
Unique ID UN7769360 
c70.jpg
Energy in the 21st Century / the Alternatives 
01/01/1981 11:51:40 
Unique ID UN7771611 
f31.jpg
Energy in the 21st Century / the Alternatives 
06/01/1981 09:15:06 
Unique ID UN7543267 
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Headline Energy for the 21st Century: The Alternatives 
Caption Description A large dam in rural Brazil, topped by a walkway.
[no date, late 1970's or early 1980's] 
Unique Identifier UN7700789 
NICA ID 147561 
Production Date 01/01/1981 10:23:19 AM 
Country Brazil
Credit UN Photo
File size 3.32 MB