"I did a lot of work on energy efficiency at the White House. By the time I left we had taken the equivalent of six hundred cars a year off the road in reduced greenhouse gas emissions just in the White House complex."

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The important issue is not how much inequality there is but how much opportunity there is for individuals to get out of the bottom classes and into the top. If there is enough movement upward, people will accept the efficiency of the markets. If you have opportunity, there is a great tolerance for inequality. That has been the saving grace of the American system.

— Milton Friedman