air pollution and global warming - stock photo

air background black blue brown burning carbon cause causes causing change chemical chimney chimneys climate co2 coal cogeneration combustion conservation contamination damage danger dioxide dirty ecology effect environment environmental factory fume fumes fuming gas global gray greenhouse greenpeace image images industry natural nature oil photo photograph photographs photograpy photos pics picture pictures pipe plant pollution problem problems production protect protecting refinery save saving sky smog smoke smokestack smokestacks stack stacking steam steel steelworks stock wallpaper warming works