Examines 'new evidence that air pollution has masked the full impact of global warming [and] suggests the world may soon face a heightened climate crisis.' Features material about history of this phenomenon going back to volcanic eruptions during the 18th-century, how contrails (vapor trails from aircraft) may influence the climate, and information about clean air technologies. Includes a teacher's guide and transcript. (Copyright 2006 by Librarians' Internet Index)
Reports on 'ongoing comprehensive evaluation of air toxics in the U.S.' Contains the results of an assessment of 1999 air toxics emissions (released in 2006), and an earlier report on 1996 toxic air pollutants.. (Copyright 2006 by Librarians' Internet Index)
