What are several differences between public risk perception and scientific risk assessment?

Study Chapter 17 Environmental Hazards and Human Health from textbook Environmental Science (Wright, 2016), write a study journal to address ALL subjects in following areas: Review chapter 17.1 pg. 410-419: What are four (4) categories of human environmental hazards? Give examples of each. Describe the public-health roles of the CDC, the WHO, the FDA and the EPA. Review chapter 17.2 pg. 420-428: List five (5) environmental risk factors that are responsible for global mortality and disease. Explain how exposure to toxic chemicals, poverty and climate change, lead to human mortality. Review chapter 17.3 pg. 428-432: Outline the four (4) steps of risk assessment issued by the EPA. Describe the process of risk assessment for public health recently carried out by the WHO. What is a DALY? What are several differences between public risk perception and scientific risk assessment?