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The Senedd dipped into darkest last night as part of WWF's Earth Hour campaign.
Caerphilly Castle, Cardiff City Hall and the Senedd were among the landmarks around the country to take part in a black out last night as part of WWF's Earth Hour.
The WWF, who are organising Earth Hour, say it's "a fantastic reminder" to protect the planet.
Iconic landmarks across Wales will turn off their lights this evening for Earth Hour, dubbed the "world's biggest celebration of the planet."
The WWF estimates around half a million people in Wales took part in last year's event.