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In October 2002, the advertising-free World was retitled National Geographic Kids and began accepting advertising. The first advertisers in Kids were The Walt Disney Company, Minolta, Nintendo, Scholastic Corporation, and Tony's Pizza. [3] A spinoff, National Geographic Explorer, continues to focus on classroom use. [4]
Air pollution can occur naturally or be caused by human activities. [4] Air pollution causes around 7 or 8 million deaths each year. [5] [6] It is a significant risk factor for a number of pollution-related diseases, including heart disease, stroke, chronic obstructive pulmonary disease (COPD), asthma and lung cancer.
Road salt, while helping cars and people to gain traction in the winter, can have serious consequences for soil. As National Geographic found, "Road salt can pollute soil at every stage in the deicing process." [39] This pollution is a result of numerous factors such as runoff, application and spray from vehicles. [39]
A recent study by the University of Southern California revealed that exposure to air pollution can harm children's learning and memory, the LA Post reports.. Ammonium nitrate, a specific ...
Sources of water pollution are either point sources or non-point sources. [155] Point sources have one identifiable cause, such as a storm drain, a wastewater treatment plant, or an oil spill. Non-point sources are more diffuse. An example is agricultural runoff. [156] Pollution is the result of the cumulative effect over time.
Air pollution, whether it’s from factories, car exhaust, or secondhand smoke from family members, is a major cause of fatal respiratory infections. Pollution kills millions of little kids a year ...