Aussies may put an end to their Great Barrier Reef restoration if they don’t get a chance to clean it themselves. At the same time, local and international tourists may also find it harder to clean.

What is the difference between at the edge of and on the edge of? What is the meaning and context of these sentences?

Would you describe your experience as “on the edge of perishing”? (I Googled it but didn’t see anyone write like this.)

Thank you!

What are the most relevant things for you, and why?