National Geographic Traveler Photo Contest 2013

In later years articles became outspoken on issues such as environment, deforestation, chemical pollution, global warming, and endangered species. Series of articles were included focusing on the history and varied uses of specific products such as a single metal, gem, food crop, or agricultural product, or an archaeological discovery. Occasionally an entire month's issue would be devoted to a single country, past civilization, a natural resource whose future is endangered, or other theme. In recent decades, the National Geographic Society has unveiled other magazines with different focuses. Whereas in the past, the Magazine featured lengthy expositions, recent issues have shorter, but nevertheless tighter articles.
Photography
In addition to being well-known for articles about scenery, history, and the most distant corners of the world, the magazine has been recognized for its book-like quality and its standard of photography. This standard makes it the home to some of the highest-quality photojournalism in the world. The magazine began to feature color photography in the early 20th century, when this technology was still rare. During the 1930s, Luis Marden (1913–2003), a writer and photographer for National Geographic, convinced the magazine to allow its photographers to use small 35 mm cameras loaded with Kodachrome film over bulkier cameras with tripods and glass plates. In 1959, the magazine started publishing small photographs on its covers, later becoming larger photographs. National Geographic photography has quickly shifted to digital photography for both its magazine on paper and its website. In subsequent years, the magazine cover, while keeping its yellow border, shed its oak leaf trim and bare table of contents, for a large photograph taken from one of the month's articles inside. Issues of National Geographic are often kept by subscribers for years and re-sold at thrift stores as collectible back-issues. In 2006, National Geographic began an international photography competition with over eighteen countries participating.