The document summarizes major environmental events and issues from 1970 to the present. It outlines the creation of the EPA in 1970 to protect human health and the environment. During the 1970s-1980s, air and water pollution were reduced through initiatives like catalytic converters and sewage treatment expansion. However, toxic chemicals from corporations and climate change emerged as serious problems. From the 1990s onward, issues like ozone depletion, global warming, toxic waste cleanup, and effects of coal mining on the environment became priorities, though tensions remained between environmental and economic interests.