Gazing up from K2 Basecamp, Sajid Ali Sadpara sees Earth's second-highest mountain, his father's final resting place, and a blight of litter on the furthest reaches of the natural world.It is a high-altitude tribute to Sajid's father, legendary climber Ali Sadpara, honouring the place where they bonded in nature and where his body remains after a 2021 father-son expedition fell foul of the "savage mountain".