Oriol Alamany / Lenga Beech forest (Nothofagus pumilio) and Frances Glacier on the W Trek, Torres del Paine National Park, Patagonia, Chile, January 2006

Oriol Alamany / Lenga forest (Nothofagus pumilio) in Ascensio river valley on the W Trek, Torres del Paine National Park, Patagonia, Chile, January 2006

Staffan Widstrand / Reindeer trekking with Saami, Lapland, Sweden, Model released

Staffan Widstrand / Silhouette of ecotourist Reindeer trek camp site with Saami, Lapland, Sweden.

Ashley Cooper / Trekkers at Annapurna base camp at 4130 metres looking towards Machapuchare, Annapurna Sanctuary, Himalayas, Nepal. December 2012.

Ashley Cooper / Trekking group at Annapurna base camp at 4130 metres in front of Annapurna South summit, Annapurna Sanctuary, Himalayas, Nepal. December 2012.

Ashley Cooper / Annapurna base camp at 4130 metres in front of Annapurna South summit, , with a sign about a cleanup campaign. Annapurna Sanctuary, Himalayas, Nepal. December 2012.

Ashley Cooper / Rosebay willowherb (Chamaenerion angustifolium) in front of Mont Chetif and the Mont Blanc range, from Refuge Bertone, above Courmayeur, Italy. August 2014.

Ashley Cooper / View towards Mont Blanc from above Val Veny. With a rock marked with the Tour du Mont Blanc long distance footpath. Italy, August 2014.

Ashley Cooper / Walkers on the Tour Du Mont Blanc share shelter from heavy rain with a goat on the Col Du Bonhomme near Les Contamines, French Alps. France. August 2014

Ashley Cooper / Walkers on the Tour Du Mont Blanc cross a suspension bridge across the meltwater river from the Bionnassay glacier; France. August 2014

Ashley Cooper / Climber on an exposed pinnacle in the Jebel Sirwa region of the Anti Atlas mountains of Morocco, North Africa. April 2012