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Ask Umbra: What kind of wood floors should I buy?

A reader wonders if he can get a pass on imported hardwood, since it's fast-growing and bee-yutiful. Umbra polishes up his understanding of sustainable timber.

Ask Umbra® Culture February 3, 2014

Republicans use Putin as an excuse to push fossil-fuel projects

They're calling on Obama to speed up natural gas exports in order to "stand up for freedom and democracy." At least one Democrat is joining in too.

Ben Adler Technology March 5, 2014

Power from the people: Human energy will fuel NYC’s New Year’s Eve ball drop

A 11,875-pound geodesic sphere, covered in 2,688 Waterford crystals, illuminated by 32,256 LED bulbs, powered completely by human energy.

Emily Atkin Cities December 31, 2013

Poultry matter: What to do with all that chicken shit?

If Tyson Foods owned agricultural waste, we might have cleaner water.

Michael Lipsky Technology January 4, 2014

Promiscuous corn can be made to behave — as long as you don’t expect perfection

Farmers have a slew of tools they can use to keep GMO grain separate from traditional crops. But none of them will deliver absolute, 100-percent results.

Nathanael Johnson Food December 2, 2013

Up the creek by pedal power: An Englishman bikes the Hudson Valley

Nick Hand rode 500 miles from Manhattan to Hudson Falls, following Pete Seeger's "dirty stream," interviewing and photographing working people along the way.

Lori Rotenberk Culture January 31, 2014

13 major clean energy breakthroughs of 2013

The rapidly improving technology, declining costs, and increasing accessibility of clean energy is the true bright spot in the march toward a zero-carbon future.

Kiley Kroh & Jeff Spross Technology December 30, 2013