Farbfoto
CC BY eutrophication & hypoxia 2.0
http://creativecommons.org/licenses/by/2.0/
Automobiles release nitrogen oxides (NOx) into the atmosphere and can be a significant source on nitrogen pollution to coastal areas
Farbfoto
CC BY Presse Nordelbien 2.0
http://creativecommons.org/licenses/by/2.0/
Farbfoto
CC BY James Cridland 2.0
http://creativecommons.org/licenses/by/2.0/
Farbfoto des Schmetterlings Vizekönig, der dem Monarchfalter sehr ähnlich sieht
CC BY Russ Ottens, University of Georgia, Bugwood.org 3.0 US
http://creativecommons.org/licenses/by/3.0/us/deed.en
Farbfoto
CC BY Highways Agency 2.0
http://creativecommons.org/licenses/by/2.0/deed.de
Photos from this set are stock images related to Wildlife Protection and Environmental Workers. Photos have been taken nationwide in September and October 2006 as part of the summer 2006 stock project.
Farbgrafik
CC BY- GFJ, SVG: Marlus_GancherSA 2.0 DE
http://creativecommons.org/licenses/by-sa/2.0/de/deed.en
Farbgrafik
CC BY-or chris ? (through works of J. Patrick Fischer, C. Schuhmacher, Madprime, Luis Fernández García, Luis Miguel Bugallo Sánchez, chung-tung yeh, Susanne Heyer and Simon Andrews) SA 3.0
Farbfoto
CC BY Dirk Ingo Franke 3.0
http://creativecommons.org/licenses/by/3.0/deed.en