Welsh hippies ushered in an era of sustainable living well before the world had woken up to climate change
Hippies in a slate quarry in Wales are celebrating four decades of green revolution this weekend, having transformed the character of a local town, pioneered new energy technologies and constructed a water-powered railway.
The Centre for Alternative Technology (Cat) near Machynlleth also created hundreds of jobs and a tourist attraction that draws in around 70,000 visitors a year.