- Who
- Australasian Dark Sky Alliance
- What
- 4283 people
- Where
- Australia (Global online - Australia, United Kingdom)
- When
The most users to take an online environmental sustainability lesson in 24 hours is 4283 people, achieved by Australasian Dark Sky Alliance (Australia) on 21 June 2020.
The lesson subject focused on light pollution and its effect on the environment.
