It always seems to help save the planet if you remove your clothes!!
This is a festival in the UK and is a mix of concerts, performance art and eco stuff.
http://www.big-green-gathering.com/
The naked cyclists were there to promote the annual ride...
and because riding a bike naked in public is good, clean fun!! As is getting covered in mud and letting the sun dry it on your naked body....on the rare occasion the UK has sun!!!!