02:59
Race, Ethnicity and Family: Economics of the African-American Family
Poverty has long been a fact of life in many African-American communities. In part this has been due to discrimination but, more recently, broad-based structural changes in the American economy have also played a part. The financial challenge fac...
02:06
Introduction to Waste Stream Management: Treatment Technologies and Pollution Sources
The approved EPA treatment technologies for solid, liquid and gaseous wastestreams can be categorized into four groups: physical, chemical, biological and thermal. Knowing which type of treatment to use and when to use it requires understanding the...