The timeline contains at least 10–15 events related to the topic being studied.

The timeline can be organized in the following time periods: 1500–1700, 1700–1900, 1900–1950, 1950–2000, 2000–present.

You will create a timeline that incorporates important early writing, the first conservation groups, disasters, legislation, community and nonprofit activism, and more. Within each time period, you can include the following.