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Founded in 1973 in a disused slate quarry in Llwyngwern near Machynlleth, The Centre for Alternative Technology, CAT, is celebrating 50 years of inspiring, informing and enabling people to achieve practical solutions for sustainability. Chris Loyn, award winning Welsh architect聽and devoted CAT person,聽tells the story of this world leading eco聽centre and internationally renowned environmental charity that provides training and support to help students, councils, communities and organisations across the world to take action on net zero.