Greenhouse gas doesn't just stay in the air. A lot of it ends up in oceans, raising acid levels in the water and threatening oyster numbers. This is an issue not only on the coast of North America but in Australia and world wide.
The new Australian documentary Oyster will premiere twice later this month, on different continents. It's not so much a doubling-up as a happy coincidence, and a coup for the filmmakers.
The first event, a world premiere, takes place on October 28 at the Canberra International Film Festival. The second, that same day, is on the east coast of the US, in Chesapeake, a region famous for its seafood, especially its clams, crabs and oysters.