Frogbit (Limnobium laevigatum) declared a pest in the ACT March 9, 2021 14:50

https://www.environment.act.gov.au/home/home-news-listing/frogbit-declared-a-pest

It is likely to increase its range under climate change:

http://weedfutures.net/species.php?id=2086

Sale is now illegal in the ACT, in line with NSW. Protect our waterways and don't purchase this species online. 

Please report any sightings via Canberra Nature Map or iNaturalist Australia

Climate Change Action February 25, 2021 16:58

Volunteers clean up tar pollution February 22, 2021 13:22

https://www.theguardian.com/world/2021/feb/21/oil-spill-from-passing-ship-blackens-israel-mediterranean-shoreline

Fossil fuel messes made by large companies are cleaned up by unpaid people.