In the following figure,the total abatement cost of abating 20 units of emissions is _______. 
Definitions:
Exxon Valdez
An oil tanker whose 1989 spill off the coast of Alaska caused one of the worst environmental disasters in U.S. history.
Anita Hill
An American attorney and academic who gained national exposure for her testimony accusing Supreme Court nominee Clarence Thomas of sexual harassment in 1991.
New World Order
A theoretical future period marked by significant global political and economic change, often mentioned in the context of conspiracy theories regarding global governance and power consolidation.
Irrational Exuberance
A term used to describe overly optimistic market behavior that is not supported by fundamentals, often leading to asset bubbles.
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