Ablation: constant or slow recede in volume + extent when snowfall melts: via melting or sublimation. Athabasca glacier: retreating since 1844, retreated more than 1. 5km, lost more than half its volume, 2-3m/year retreating rate, glaciers throughout world has been retreating since little ice age, rockies will be ice-free by end of this century. Our dynamic climate: climate change is fastest moving area of environmental science. What is climate change: global warming refers speci cally to increase in earth"s average surface temperature, only one aspect of global climate change, human activities: fossil fuel combustion + deforestation. Sun: earth would be dark and frozen. Atmosphere: 33*c colder at night and warmer during day, ocean, shapes climate by storing + transporting heat + moisture, albedo: re ectivity of a surface(atmosphere, earths surface, and ocean) Carbon dioxide is the anthropogenic greenhouse gas of primary.