What evidence is there that the O’Higgins Glacier is being affected by global warming? View Available Hint(s) What evidence is there that the O’Higgins Glacier is being affected by global warming? It has retreated nine miles in the past 100 years because of melting. It has grown nine miles in the past 100 years because warmer temperatures have caused melting along the edge of the glacier, allowing it to move more quickly. It has retreated nine miles in the past 100 years because of a dramatic decrease in snowfall at the source of the glacier. It has grown nine miles in the past 100 years because of increased snow pack at extremely high elevations. There is no evidence that the changes of O’Higgins are being affected by global warming.