Text book environmental law & policy

I like OTA 102862 help me to solve this problems

1.- Why is the clean air Act of 1970 viewed as relatively strong legislation compared with earlier legislation focused on air quality?

2.-comment on the significance of the following provisions or aspects of the CAA of 1970: national ambient air quality standards; SIPs; attainment and nonattainment regions; air pollution credits and permits; the basis of designation of a region as attainment or nonattainment.

3.- What are the major policy aspects of the Clean Water Act?

4.- What is the history and statutory basis for federal regulation of wetlands? What are the national permits? What are the origin and significance of the no net loss policy?