The objective of imposing a higher pollution tax is to ensure firms have pollution charge credits for all reduced emissions. provide incentive for firms to maintain regulation emission levels. provide adequate incentive for firms to reduce their emissions by more. ensure firms must pay the pollution charge for all reduced emissions.

provide adequate incentive for firms to reduce their emissions by more.

Explanation:

Pollution charge can be regarded as a tax imposed on firms based on the quantity of pollution emmitted to atmosphere by the firm. With imposition of pollution tax, profit-maximizing firm would have the incentive to look out for ways to reduce the firm's emissions provided the marginal cost required to reduce the emissions is not equal or more than the tax. It should be noted that the objective of imposing a higher pollution tax is to ensure firms have pollution charge credits for all reduced emissions provide adequate incentive for firms to reduce their emissions by more.

the page presents four different kinds of threats that volcanoes pose and what to do before, during, and after an eruption.