Climate Change Extreme Environmental Threats Every living thing requires nitrogen to survive--and the delicate balance of the nitrogen cycle is under threat by human activity. Explore the very real and observable climatic effects of increased nitrogen levels in our atmosphere. Library Bound Book List: $37.13 / S&L: $27.85 Library Bound Book Reading Level: 6 Interest Level: 7-12+ Product type : Library Bound Book ISBN : 978-1-4042-0744-8 Author : Jeri Freedman Copyright : 2007 Language : English Category : Technology, Current Events Pages : 64 Trim : 7 1/4" x 9 1/4" Dewey : 577.27 ATOS : 9.7 ARPoints : 2 Subject : Technology, Current Events Binding : Library BISAC : JNF051160