 Complete the following phrase:  In an interview about his 2015 attempt, Joisher declared that his motivation to climb Everest was to disprove the notion that a vegan diet is nutritionally deficient, and wanted to use clothing and equipment not made from animal products. This attempt also saw Joisher reach for crowd funding; he offered to give away his Everest summit ice-axe to anyone who donated over Rs. 100,000. His attempt to be the first vegan to summit from the south side failed due to an avalanche that was caused by the 