"If the forest continues to disappear at its present pace, the koala will approach extinction," said the biologist. "...

Mehran, my issue is would be with the placement of the diagram, in that, "so all that is needed to save the koala is to stop deforestation." I believe so is a necessary indicating word and all is a sufficient indicating word and as such, my assumption is that it would be: KAE ==> not D (contra: D==>not KAE)