In the case of Everest, this competition has revolved around the use of supplementary oxygen, a practice that has been hotly debated since 1921, when British climbers — without oxygen — mounted the first Everest expedition. (si.com)
In 2013, she was diagnosed with scleroderma, a lung condition for which she needed supplementary oxygen to help her breathe. (health.com)
Ever since, the battle has raged over whether climbing Everest using supplementary oxygen represents an ascent «by fair means,» a standard of some importance to climbers. (si.com)