...the grasslands, forests, crops and continental shelf of Australia sequester far more carbon dioxide...
When plants grow, they pull carbon out of the atmosphere, and, when they die and decay, they release that carbon back into the atmosphere.
The only true “carbon sequestration” by living beings is the production of shells by oyster and clams and the like.
Not exactly.
That is sequestration - albeit only temporary.
[...] The only true “carbon sequestration” by living beings is the production of shells by oyster and clams and the like.
That, too, is only temporary (albeit on a longer scale).
Regards,