Rock climbers like to connect with nature - but are they also destroying it?

Outdoor climbing has boomed in popularity worldwide but some experts say the pursuit can push vulnerable cliff-dwelling species to the brink When Laura Boggess first visited the cliff face in Boone, North Carolina, she admired the colourful rock tripe covering the vertical surface, and the green moss mats perched on top. The crag was part of a rolling, mountainous landscape, sheer cliffs jutting above an enormous valley filled with trees of varying shades of green. It showcased the pristine, usu...