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As Environment Canada mentions "soil degradation degrades the land and places significant stress on ecologically sensitive biota and flora". Soil degradation in Canada's biologically sensitive forests as a result of pollution, is one of the most significant cases of degradation in the country. One study found that 12% of Alberta's forests’ soils are over their acid carrying capacity. This rise in acidity is attributed to the continual extraction of fossil fuel from the Alberta oil sands. Oil refinery sites, like those found in Alberta, have become some of the most dominant contributors to Canadian soil pollution. A further example can be witnessed in Calgary, where a neighbourhood built on an old Imperial Oil refinery needed their soil replaced due to contamination.