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It traces the primary factors involved in the renormalization of Sino-Vietnamese relations as well as the key opportunities and challenges this era of normalcy poses to each nation . Dyson calls these new technologies " green " because they are based on biology rather than physics or chemistry , which are the primary foundations of what he calls the " gray " technologies of industry . Still , the main emphasis of the exam is the list itself , and specifically the primary texts ( you should use the “ general reference ” books to help you prepare , but your principal task is to read and understand the primary texts ) . The focus has shifted over the last 20 years from assessing the problems and imposing end-of-pipe solutions to addressing the primary sources , on land , of aquatic environmental problems .