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Photo Credits

Page 6: © EzumeImages/iStockphoto.com; 8: © HadelProductions/iStockphoto.com; 10: © schmidt-z/iStockphoto.com; 19: © almir1968/iStockphoto.com; 39: © shaunl/iStockphoto.com; 64: © manfredxy/iStockphoto.com; 84: © AndreyPopov/iStockphoto.com; 91: © querbeet/iStockphoto.com; 94: © Pgiam/iStockphoto.com, 103: © Imaginima/iStockphoto.com; 105: © Carlos Alvarez/iStockphoto.com; © BlackJack3D/iStockphoto.com; © Tran The Vuong/iStockphoto.com; 109: © Samuel Kessler/iStockphoto.com; baytunc/iStockphoto.com; 110: © travellinglight/iStockphoto.com; 111: © Peter Mukherjee/iStockphoto.com; 112: © zstockphotos/iStockphoto.com; © levkr/iStockphoto.com; 119: © tzahiV/iStockphoto.com; © 129: tomprout/iStockphoto.com;

Photographs on pages 13, 14, 25, 34, 36, 37, 38, 57, 83, and 160 courtesy of National Renewable Energy Laboratory. © 2016 by National Renewable Energy Laboratory.

All other photographs courtesy of the author.

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