The United States Environment Protection Authority has defined five tiers of environmental costs. Name these five tiers and provide a brief description with an example for each tier. 
Definitions:
Indifference Curve
A curve representing all combinations of goods and services among which a consumer is indifferent, showing the same level of satisfaction or utility.
Budget Line
A graphical representation of all possible combinations of two goods or services that can be purchased with a given income and prices, identical to the concept of a budget constraint but rephrased.
Duality
Alternative way of looking at the consumer’s utility maximization decision: Rather than choosing the highest indifference curve, given a budget constraint, the consumer chooses the lowest budget line that touches a given indifference curve.
Marginal Utilities
Refers to the additional satisfaction or utility that a consumer receives from consuming one more unit of a good or service.
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