What is an amplified example of negative externality in economics?

A more definitive answer to an example of a negative externality is as follows. When the production of a product generates pollution, there are costs that fall onto society in addition to those of the producer. This may have the social cost exceed the private cost of production. This brings us to the term of total surplus. In this example, total surplus is the value to consumers minus the true social cost. With this said, it boils down to this: when the benefit to society is less than the weight of the externality, it is a sure negative.