Timelines can provide a context for reinvigorating local sustainability action, and provide evidence to challenge for example, global warming deniers who may come out with statements such as "concern has only become widespread in the last 18 months"
Timelines can be arranged to provide more of a summary, or a summary and then further detail.
Recent timelines in this wiki Edit
The News sections of this wiki for example Global news, News UK, provide a sort of timeline. Timelines by topic (or topic and location) can be found (or created) on topic pages within this wiki, by a series of news links included in the article. See, for example, Climate change UK news