Sunday, May 20, 2012
Next Step After Carbon: Knowing Your Nitrogen Footprint
[youtube]http://www.youtube.com/watch?v=94wkMDX1ulM[/youtube]Tags: captioned, subtitled, videos, voa, learning special english, report, development, agriculture, food, farming, gardening, health, medicine, higher, education, international, students, elementary, secondary, tertiary, university, college, economics, finance, american, business, communication, culture, download, history, foreign, controlled, language, learn, mp3, music, news, plain, radio, simplified, simple, speech, linguistics, teach, teacher, esl, efl, teaching, texts, transcripts, TV, u.s. united states voice of america
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