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tree plant wilderness forest spruce winter mountain branch woodland ridge nature trail snow trunk fir flower dead background cloudy sky trees air pollution co2 so2 emission dead trees dying tree acid rain rains acidic air pollution atmospheric atmospheric biosphere reserve burning carbon carbon dioxide co2 coal destruction ecological catastrophe damage disaster ecology emissions environment protection environmental forest fossil fuel fuels gases global warming industrial karkonosze krkonose mountains nature nitrogen nitrogen oxides smog so2 spruces sulfur sulfur waste