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  • Katy Barnhart puts on sunscreen inside the Lower Montgomery Pass Yurt in Colorado State Forest State Park, Colorado.
    110319_0602.JPG
  • Skis at night outside the glowing Lower Montgomery Pass Yurt in Colorado State Forest State Park, Colorado.
    110318_0354.JPG
  • A full moon rises over silhouetted trees in Colorado State Forest State Park, Colorado.
    110319_0709.JPG
  • Environmental Studies graduate student Alex Lee at Varsity Lake in winter after a snow storm, University of Colorado campus, Boulder, Colorado.
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  • Varsity Lake in winter, University of Colorado campus, Boulder, Colorado.
    110000_r0002_12.JPG
  • Varsity Lake in winter, University of Colorado campus, Boulder, Colorado.
    110000_r0002_02.JPG
  • A sprinkler sprays water against trees on the University of Colorado campus in Boulder, Colorado.
    090928_5891.JPG
  • Brick bridge across Varsity Lake in winter, University of Colorado campus, Boulder, Colorado.
    110000_r0002_07.JPG
  • Red brick wall, University of Colorado, Boulder, Colorado.
    100000_r9935_07.JPG
  • A sprinkler sprays water against trees on the University of Colorado campus in Boulder, Colorado.
    090928_5899.JPG
  • A sprinkler sprays water against trees on the University of Colorado campus in Boulder, Colorado.
    090928_5897.JPG
  • Multiple exposure panorama of the University of Colorado campus covered in snow in Boulder, Colorado.
    110000_r0001_43_pan_crop2.JPG
  • Multiple exposure of a tall cottonwood (Populus sp.) tree covered in snow on the University of Colorado campus in Boulder, Colorado.
    110000_r0001_42.JPG
  • Sunset over the Never Summer Range of Colorado (Baker Mountain and Mount Stratus), as seen from Baker Gulch, Never Summer Wilderness, Colorado.
    100606_9707.JPG
  • A student walks past garbage cans on the University of Colorado campus, Boulder, Colorado.
    110000_r5000_14.JPG
  • Multiple exposure of Varsity Lake, on the University of Colorado campus, in winter in Boulder, Colorado.
    110000_r0001_45.JPG
  • Multiple exposure of Varsity Lake, on the University of Colorado campus, in winter in Boulder, Colorado.
    110000_r0001_44.JPG
  • Multiple exposure panorama of Varsity Lake, on the University of Colorado campus, in winter in Boulder, Colorado.
    110000_r0001_43_pan_crop.JPG
  • Multiple exposure panorama of Old Main and the University of Colorado campus covered in snow in Boulder, Colorado.
    110000_r0001_39_pan.JPG
  • A student observes satellite data of the Earth (mean sea surface temperature) projected onto a sphere at the Fiske Planetarium at the University of Colorado campus in Boulder, Colorado.
    091130_7196_alt.JPG
  • NASA Chief Scientist Waleed Abdalati projects satellite imagery of the Earth onto a sphere for students at the Fiske Planetarium at the University of Colorado campus in Boulder, Colorado.
    091130_7183.JPG
  • A student observes satellite data of the Earth (mean sea surface temperature) projected onto a sphere at the Fiske Planetarium at the University of Colorado campus in Boulder, Colorado.
    091130_7193_alt.JPG
  • University of Colorado geology graduate student Francis Rengers installs a LiDAR laser scanning target for his research studying stream erosion at the Plains Conservation Center boundary near Strasburg, Colorado.
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  • Kelsey Cody, runner and environmental studies graduate student at the University of Colorado, on Mount Sanitas in Boulder, Colorado.
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  • Kelsey Cody, runner and environmental studies graduate student at the University of Colorado, on Mount Sanitas in Boulder, Colorado.
    100410_0257.JPG
  • Daan Stevenson does a backflip off of a jump during a ski tour with the University of Colorado Backcountry Club to Jenny Lind Gulch, Arapaho National Forest, Colorado.
    110123_9658.JPG
  • Teenage girls tumble through a Slip 'n Slide at the 2012 Bolder Boulder 10K road race in Boulder, Colorado.
    120529_3820.JPG
  • David Coffey (l-r) and Marco Binotti watch the solar eclipse on May 20, 2012 near Pine, Colorado.
    120520_3443.JPG
  • Glaciologist, author, and photographer William Tad Pfeffer near his home in Nederland, Colorado.
    120513_2233.JPG
  • Island Peaks from Big Island View, Black Canyon of the Gunnison National Park, Colorado.
    120428_0340.JPG
  • Trees on a narrow rock ridge in Eldorado Canyon State Park, Colorado.
    120317_0439_pan.JPG
  • Obadiah Reid lead climbs the first pitch of Icarus (5.6) on Redgarden Wall, Eldorado Canyon State Park, Colorado.
    120317_0015.JPG
  • Obadiah Reid takes pictures on the summit of Twin Sisters Mountain at sunrise in Rocky Mountain National Park, Colorado. The rolling hills of the Front Range extend behind him towards the plains.
    120310_9479.JPG
  • Friends play cards at Francie's Hut, a backcountry cabin in Arapaho National Forest, Colorado.
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  • James Meldrum studies a topo map on the summit of Longs Peak, Rocky Mountain National Park, Colorado. Chiefs Head is visible in the background.
    110719_9259.JPG
  • Mountain views from Longs Peak (looking NNW), Rocky Mountain National Park, Colorado.
    110719_9161.JPG
  • James Meldrum takes in breathtaking views from the Keyhole on Longs Peak, Rocky Mountain National Park, Colorado.
    110719_9118_pan.JPG
  • James Meldrum in the Boulder Field below Longs Peak at sunrise, Rocky Mountain National Park, Colorado.
    110719_9069.JPG
  • View of Front Range July 4th fireworks displays from the Flatirons above Boulder, Colorado.
    110704_8228.JPG
  • A male yellow warbler (Setophaga petechia) lies dead on the side of a road near Crested Butte, Colorado.
    110621_7522.JPG
  • A crowd sits outside on picnic tables for a concert at the Gold Hill Inn in Gold Hill, Colorado.
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  • Granite rock formations in mist above McMurdy Park, Lost Creek Wilderness, Colorado.
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  • Whitehouse Mountain at sunrise, San Juan Mountains, Colorado.
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  • City street covered in snow in Boulder, Colorado.
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  • A group of hikers on the trail to Mount Sanitas in Boulder, Colorado.
    100410_0187.JPG
  • Backcountry skiers take a break on a jeep road lined with aspen trees in Uncompahgre National Forest, Colorado.
    110324_0974.JPG
  • Backcountry skier Sterling Roop descends from the summit of Hayden Peak, San Juan Mountains, Colorado, with the Sneffels Range in the background.
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  • Backcountry skiers ascend the loose talus slopes of Hayden Peak, San Juan Mountains, Colorado.
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  • Backcountry skiers Sterling Roop (left) and Judd MacRae at the top of a couloir below Hayden Peak, San Juan Mountains, Colorado.
    110324_1061.JPG
  • Backcountry skiers Sarah Conlin, Meaghan Daly and Emily Miller battle fierce wind and blowing snow in Uncompahgre National Forest, Colorado.
    110324_0935.JPG
  • Driving towards the Sneffels Range in the San Juan Mountains, Colorado.
    110324_0837.JPG
  • View over Boulder, University of Colorado and the coal-powered Valmont Power Plant from Chautauqua Park, Boulder, Colorado.
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  • Crowds of spectators at Conor O'Neill's pub in Boulder, Colorado jump for joy as Clint Dempsey scores a goal for the US during the World Cup soccer match between England and the USA on June 12, 2010. The match ended in a 1-1 tie.
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  • Eric Ross stands proudly with a mock wind turbine on top of the large coal mound at the Valmont Power Plant in Boulder, Colorado on April 27, 2010. During the protest for more renewables, Ross and three other climate activists claimed the coal mound for over an hour before being arrested for trespass.
    100427_0552.JPG
  • Young men float down Boulder Creek in inner tubes on a hot summer day in Boulder, Colorado.
    120809_7362.JPG
  • Friends chat out on the banks of Boulder Creek at Eben G. Fine Park on a hot summer day in Boulder, Colorado.
    120809_7300.JPG
  • Bathers and dogs go for a dip in Boulder Creek at Eben G. Fine Park on a hot summer day in Boulder, Colorado.
    120809_7270.JPG
  • Children sell lemonade on a hot summer day in Boulder, Colorado.
    120809_7265.JPG
  • A young woman performs classical music on the violin on the pedestrian Pearl Street Mall in Boulder, Colorado.
    120809_7257.JPG
  • Alessandro Lauria, 12, rushes through a jet of water running in the 2012 Bolder Boulder 10K road race in Boulder, Colorado.
    120529_4388.JPG
  • Savannah Thaler, 6, rushes through bubbles running in the 2012 Bolder Boulder 10K road race in Boulder, Colorado.
    120529_4179.JPG
  • A woman competes with a flower in her hair in the 2012 Bolder Boulder 10K road race in Boulder, Colorado.
    120529_4010.JPG
  • The partial solar eclipse on May 20, 2012 seen from near Pine, Colorado.
    120520_3464.JPG
  • Marco Binotti watches the solar eclipse through three pairs of sunglasses on May 20, 2012 near Pine, Colorado.
    120520_3453.JPG
  • David Coffey watches the solar eclipse through three pairs of sunglasses on May 20, 2012 near Pine, Colorado.
    120520_3432.JPG
  • Dandelion (Taraxacum sp.) seedheads at sunset in Boulder, Colorado.
    120509_2182.JPG
  • Small white flowers growing from a bed of cottonwood "cotton" (seeds and seed hairs) in Boulder, Colorado.
    120509_2128.JPG
  • Precipitous view of the Gunnison River from Island Peaks, Black Canyon of the Gunnison National Park, Colorado.
    120429_1059.JPG
  • Obadiah Reid stands on the canyon rim at Island Peaks, Black Canyon of the Gunnison National Park, Colorado.
    120429_1043.JPG
  • View of the canyon and the Gunnison River from Island Peaks, Black Canyon of the Gunnison National Park, Colorado.
    120429_1005.JPG
  • A dead snag on the canyon rim at Island Peaks, Black Canyon of the Gunnison National Park, Colorado.
    120429_0909.JPG
  • Backlit detail of canyon wall, Black Canyon of the Gunnison National Park, Colorado.
    120429_0899.JPG
  • Moonlit view from Island Peaks, Black Canyon of the Gunnison National Park, Colorado.
    120428_0686.JPG
  • Obadiah Reid peers over the canyon rim at Island Peaks in Black Canyon of the Gunnison National Park, Colorado.
    120428_0606_pan_crop.JPG
  • Obadiah Reid takes pictures from Island Peak at sunset in Black Canyon of the Gunnison National Park, Colorado.
    120428_0588.JPG
  • Obadiah Reid looks out towards The Narrows from Island Peaks at sunset in Black Canyon of the Gunnison National Park, Colorado.
    120428_0581.JPG
  • Obadiah Reid takes pictures from Island Peaks at sunset in Black Canyon of the Gunnison National Park, Colorado.
    120428_0578.JPG
  • Obadiah Reid enjoys the views from Island Peaks at sunset in Black Canyon of the Gunnison National Park, Colorado.
    120428_0565.JPG
  • A man photographs himself at the Island Peaks View overlook in Black Canyon of the Gunnison National Park, Colorado.
    120428_0533.JPG
  • Island Peaks from the North Rim, Black Canyon of the Gunnison National Park, Colorado.
    120428_0510_pan.JPG
  • Obadiah Reid takes pictures from near Big Island View, Black Canyon of the Gunnison National Park, Colorado.
    120428_0387.JPG
  • A parked car at night in a parking area at Eldorado Canyon State Park, Colorado.
    120410_0466_pan.JPG
  • A climber at night on a rock route in Eldorado Canyon State Park, Colorado.
    120410_0438.JPG
  • A young man rock climbs in Clear Creek Canyon, Colorado.
    120326_9305.JPG
  • A pair of hikers descend the ridge to Grizzly Peak near Loveland Pass, Rocky Mountains, Colorado.
    120318_0285.JPG
  • Two climbers on the The Bastille, Eldorado Canyon State Park, Colorado.
    120317_0513.JPG
  • Obadiah Reid lead climbs the final pitch of Icarus (5.6) on Redgarden Wall, Eldorado Canyon State Park, Colorado.
    120317_0276.JPG
  • Nathan Kurz on the approach to Chasm Lake, Rocky Mountain National Park, Colorado.
    120316_9656.JPG
  • Glacial erratic near Chasm Lake, Rocky Mountain National Park, Colorado.
    120316_9619.JPG
  • Rolling forested hills backlit at sunrise along the Front Range in Rocky Mountain National Park, Colorado.
    120310_9559_pan.JPG
  • Moon over Longs Peak, Rocky Mountain National Park, Colorado.
    120310_9518.JPG
  • Moon over Longs Peak at sunrise, Rocky Mountain National Park, Colorado.
    120310_9472.JPG
  • The rocky summit of Twin Sisters Mountain at dawn in Rocky Mountain National Park, Colorado.
    120310_9436.JPG
  • Obadiah Reid on the summit of Twin Sisters Mountain at dawn in Rocky Mountain National Park, Colorado. The moon is setting over Longs Peak behind him.
    120310_9415.JPG
  • Obadiah Reid on the summit of Twin Sisters Mountain at dawn in Rocky Mountain National Park, Colorado. The moon is setting over Longs Peak behind him.
    120310_9413.JPG
  • A young man reads a book at Francie's Hut, a backcountry cabin in Arapaho National Forest, Colorado.
    111212_9417.JPG
  • Rylan Bowers hikes near Lower Crystal Lake and Crystal Peak, moonlit at night in the Tenmile Range, Arapaho National Forest, Colorado.
    111211_2831.JPG
  • Houses bordering Palo Park are framed between cottonwood trees (Populus sp.) after a snow storm in Boulder, Colorado.
    111201_2762.JPG
  • A large cottonwood trees (Populus sp.) grows next to a small house after a snow storm in Boulder, Colorado.
    111201_2756.JPG
  • Cars buried in snow in Palo Park after a blizzard in Boulder, Colorado.
    111102_2006.JPG
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