"The 20th century was the time when the world turned to use of fossil fuels and the 21st century will be the century of the renewables."

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You had a flood of immigrants, millions of them, coming to this country. What brought them here? It was the hope for a better life for them and their children. And, in the main, they succeeded. It is hard to find any century in history, in which so large a number of people experience so great an improvement in the conditions of their life, in the opportunities open to them, as in the period of the 19th and early 20th century.

— Milton Friedman