WWF Earth Hour: Welsh landmarks plunged into darkness 23 March 2013 Last updated at 09:18 Some of Wales' landmarks will be plunged into darkness for an hour later as part of the World Wildlife Fund's (WWF) Earth Hour. The Senedd, the National Library of Wales in Aberystwyth, and Venue Cymru in Llandudno are taking part in the worldwide event at 20:30 GMT. The annual Earth Hour event aims to send a symbolic message about the need to protect the planet. Two hundred Welsh schools are also involved in this year's project. Thirteen councils are taking part, while 18 assembly members will attend an event in the Senedd to mark the 60 minutes of darkness. Meanwhile, thousands of individuals and families in Wales are expected to join millions around the world by switching off their lights at home. Last year, landmarks from Big Ben in London to the India Gate in New Delhi, and the Sydney Opera House took part. More than 150 countries are taking part this year. Poets and artists in Wales are inspiring people to have fun during the hour of darkness. Welsh artist Pete Fowler, best known for creating album covers for the Super Furry Animals, has come up with a poster urging people to live a life less electrical, as part of a collection released by environmental charity Do The Green Thing in the run up to Earth Hour. Head of WWF Cymru Anne Meikle said: "Earth Hour is a simple idea that's gone global. It's all about people coming together to focus on this brilliant world we all share and think about how we need to protect it. Hundreds of millions of people turn off their lights for one hour, on the same night, all across the planet - a visual demonstration that shows just how much people care about our wonderful planet. Budding poets But more importantly, every single person who takes part is adding invaluable support to a global movement that recognises the importance of the world, and the vital way in which its seven billion inhabitants treat it. At Swansea Community Farm there will be a pedal-powered mini festival with the audience invited to pedal a bicycle to generate power for the sound system, with an acoustic concert during the hour itself. Earlier in the day, visitors can make recycled candles and willow lanterns. Budding poets will gather in Chapter Arts Centre in Cardiff to read poetry on the theme of renewable energy, and illustrator Matt Joyce will create an Earth Hour image from LED lights outside the venue. At Victoria Gardens in Neath, the lights will go out for a night walk featuring a giant puppet and LED and fire shows.