Edgar asserts that we shouldn’t shut down pumps supplying water to our region simply because those pumps threaten a small species of fish. The shut down would cause too much inconvenience for so little benefit.

Rafaela’s implicit conclusion is that the decision to shut down the water pumps is a good idea. This is because the threat to the fish species is a sign of a threat to the water supply.

We’re looking for a point of disagreement. The speakers disagree over whether shutting down the pumps is a good idea and about whether the decision to shut down the pumps is designed only to protect the fish species. Edgar thinks the decision is just about the fish. Rafaela thinks it’s also about the water supply.