dead trees in a forest due to air pollution. co2 and so2 emission

woodland tree forest plant trail wetland vegetation wilderness jungle shrub deciduous flower branch grass acid rain rains acidic air pollution atmospheric biosphere reserve burning carbon dioxide co2 coal dead destruction dying ecological catastrophe damage disaster ecology emissions environment protection environmental fossil fuel fuels gases global warming industrial karkonosze krkonose mountains nature nitrogen oxides smog so2 spruce spruces sulfur trees waste emission pollution emission