| 1 | Yellow aspen leaves reflect brightly off the morning sun. | |
| 2 | Aspens at their autumn peak in early October in Rocky Mountain National Park, Colorado. | |
| 3 | Producing ethanol by breaking down cellulosic materials, such as switch-grass or fast-growing trees like hybrid poplars, with enzymes is promising. | |
| 4 | In central Georgia, sweet gum and poplars grow like weeds, and, it turns out, these trees make perfect chopsticks. Their wood is pliable, straight and has a nice color. | |
| 5 | Shooting from a building slightly above the aspens made for an unusual angle for glowing gold autumn colors. |
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