Contrary to images of "going back to the Stone Age, " this form of energy efficiency actually increases the levels of illumination (and thus literacy), while trimming greenhouse gas emissions, indoor air pollution and energy bills that mire the poor in poverty.

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For example, the gas lamps of Lincoln's time wouldn't give enough illumination for the cameras, which are not as sensitive as the eye.

WSJ: Spielberg's Eye | Lincoln | Janusz Kaminski | Cultural Conversation by David Mermelstein