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Columnist

Allen Best

U.S. Sen. Cory Gardner, R-Colo. (Alex Wong, Getty Images file)

Best: How a carbon tax can help Cory Gardner — and the rest of us

April 18, 2016 at 6:07 p.m.

Best: How a carbon tax can help Cory Gardner — and the rest of us

A bleached "bathtub ring" is visible on the rocky banks of Lake Powell on March 28 in Lake Powell, Utah. Now, even after good snow years in the headwaters, water levels in Mead continue to fall, now to 35 percent of capacity, the lowest since the 1930s.

Best: Peering into bottom of the water barrel

April 19, 2016 at 4:34 p.m.

Best: Peering into bottom of the water barrel

A power developer proposes to harness the power of tumbling water in the South Canal, located east of Montrose, to produce 990 kilowatt-hours of electricity, or enough for 1,445 people. (Allen Best, Special to The Denver Post)

Best: Colo. canal offers a peek into future of energy

April 21, 2016 at 1:30 a.m.

Best: Colo. canal offers a peek into future of energy

Mine wastewater pours out of pipes alongt the Animas River on Aug. 7. (Brent Lewis, The Denver Post)

Best: Kicking the environmental can down the river

April 21, 2016 at 11:46 p.m.

Best: Kicking the environmental can down the river

A boy enjoys a rocky outcropping in Rocky Mountain National Park, just outside of Estes Park. It is the 100th anniversary of the popular park

Best: 100 years of Rocky Mountain National Park

April 21, 2016 at 11:35 p.m.

Best: 100 years of Rocky Mountain National Park

B.J. "Red" McCombs, who was worth $1.85 billion as of December, according to Forbes magazine, is now 87. Eric Gray, The Associated Press

Best: Wolf Creek impasse

April 22, 2016 at 7:15 p.m.

Best: Wolf Creek impasse

Construction workers at Camp Hale in Eagle County in the 1940s. Denver and Rio Grande Western Railroad tracks are near the workers. (Photo courtesy of Denver Public Library, 10th Mountain Division Collection)

Best: What history are we preserving?

April 25, 2016 at 6:58 a.m.

Best: What history are we preserving?

A placard is tied to a fence outside the vacant lot where Walter Scott, the 50-year-old man who was killed as he ran away from an officer after a traffic stop in North Charleston, S.C., on April 8. (Jim Watson, AFP/Getty Images)

Best: Danny Smith was killed by a cop, too

April 25, 2016 at 4:50 a.m.

Best: Danny Smith was killed by a cop, too

These solar panels in Mocksville, N.C., will generate 430,000 kilowatts of electricity, enough to power 50 homes.

Best: Assessing our rapidly changing world of energy

May 21, 2016 at 3:19 p.m.

Best: Assessing our rapidly changing world of energy

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Best: Adapting to climate change will cost us plenty, too

March 6, 2015 at 4:12 a.m.

Best: Adapting to climate change will cost us plenty, too