Now playing Next world news World landmarks switch the lights off to mark Earth Hour WWF says 180 countries and territories took part in this year's event to raise awareness of climate change 31/03/2019
Now playing Next world news Lights go out for 11th annual Earth Hour More than 180 countries have taken part in the annual Earth Hour, switching off lights on thousands of major buildings 25/03/2018
Now playing Next no comment Earth Hour around the world March 24th marks the 11th annual Earth Hour and to draw attention to climate change. 24/03/2018
Now playing Next world news Earth Hour plunges world into darkness to fight climate change Earth Hour, the annual campaign to fight climate change has seen the world plunged into darkness for the tenth time. 25/03/2017
Now playing Next world news Clocks go forward one hour tonight We will "Spring forward" into British Summertime with more daylight in the evenings and less in the mornings. 25/03/2017
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